E1 := (-2*N(t)^4*(((3/2*a(t)*(D@@2)(a)(t)+3*D(a)(t)^2)*D(phi)(t)^2+a(t)*((D@@3)
(phi)(t)*a(t)+3/2*D(a)(t)*(D@@2)(phi)(t))*D(phi)(t)+1/2*(D@@2)(phi)(t)^2*a(t)^2
)*N(t)^2+((-a(t)^2*(D@@2)(N)(t)-3*a(t)*D(N)(t)*D(a)(t))*D(phi)(t)^2-4*D(phi)(t)
*(D@@2)(phi)(t)*a(t)^2*D(N)(t))*N(t)+7/2*D(phi)(t)^2*a(t)^2*D(N)(t)^2)*D(phi)(t
)^2*A3(-1/N(t)^2*D(phi)(t)^2)+2*N(t)^6*((-9/2*D(phi)(t)^2*D(a)(t)^2+((D@@3)(phi
)(t)*a(t)^2+3*(D@@2)(phi)(t)*D(a)(t)*a(t))*D(phi)(t)-1/2*(D@@2)(phi)(t)^2*a(t)^
2)*N(t)^2+((-a(t)^2*(D@@2)(N)(t)-3*a(t)*D(N)(t)*D(a)(t))*D(phi)(t)^2-2*D(phi)(t
)*(D@@2)(phi)(t)*a(t)^2*D(N)(t))*N(t)+5/2*D(phi)(t)^2*a(t)^2*D(N)(t)^2)*A1(-1/N
(t)^2*D(phi)(t)^2)+2*N(t)^6*(((3*a(t)*(D@@2)(a)(t)-15/2*D(a)(t)^2)*D(phi)(t)^2+
D(phi)(t)*(D@@3)(phi)(t)*a(t)^2-1/2*(D@@2)(phi)(t)^2*a(t)^2)*N(t)^2+((-a(t)^2*(
D@@2)(N)(t)-3*a(t)*D(N)(t)*D(a)(t))*D(phi)(t)^2-2*D(phi)(t)*(D@@2)(phi)(t)*a(t)
^2*D(N)(t))*N(t)+5/2*D(phi)(t)^2*a(t)^2*D(N)(t)^2)*A2(-1/N(t)^2*D(phi)(t)^2)-2*
N(t)^4*((((D@@3)(phi)(t)*a(t)+3*D(a)(t)*(D@@2)(phi)(t))*D(phi)(t)+1/2*(D@@2)(
phi)(t)^2*a(t))*N(t)^2+((-a(t)*(D@@2)(N)(t)-3*D(N)(t)*D(a)(t))*D(phi)(t)^2-4*a(
t)*D(N)(t)*D(phi)(t)*(D@@2)(phi)(t))*N(t)+7/2*a(t)*D(N)(t)^2*D(phi)(t)^2)*D(phi
)(t)^2*a(t)*A4(-1/N(t)^2*D(phi)(t)^2)+2*N(t)^2*((((D@@3)(phi)(t)*a(t)+3*D(a)(t)
*(D@@2)(phi)(t))*D(phi)(t)+3/2*(D@@2)(phi)(t)^2*a(t))*N(t)^2+((-a(t)*(D@@2)(N)(
t)-3*D(N)(t)*D(a)(t))*D(phi)(t)^2-6*a(t)*D(N)(t)*D(phi)(t)*(D@@2)(phi)(t))*N(t)
+9/2*a(t)*D(N)(t)^2*D(phi)(t)^2)*D(phi)(t)^4*a(t)*A5(-1/N(t)^2*D(phi)(t)^2)-2*N
(t)^4*D(phi)(t)^2*(((D@@2)(phi)(t)^2*a(t)^2-3*D(phi)(t)^2*D(a)(t)^2)*N(t)^2-2*D
(phi)(t)*(D@@2)(phi)(t)*N(t)*a(t)^2*D(N)(t)+D(phi)(t)^2*a(t)^2*D(N)(t)^2)*D(A1)
(-1/N(t)^2*D(phi)(t)^2)+((-2*D(phi)(t)^2*(D@@2)(phi)(t)^2*a(t)^2+18*D(phi)(t)^4
*D(a)(t)^2)*N(t)^6+4*N(t)^5*D(phi)(t)^3*(D@@2)(phi)(t)*a(t)^2*D(N)(t)-2*D(N)(t)
^2*a(t)^2*N(t)^4*D(phi)(t)^4)*D(A2)(-1/N(t)^2*D(phi)(t)^2)+2*N(t)^2*a(t)^2*D(
phi)(t)^4*(-D(N)(t)*D(phi)(t)+(D@@2)(phi)(t)*N(t))^2*D(A3)(-1/N(t)^2*D(phi)(t)^
2)+2*a(t)^2*(-D(N)(t)*D(phi)(t)+(D@@2)(phi)(t)*N(t))^2*N(t)^2*D(phi)(t)^4*D(A4)
(-1/N(t)^2*D(phi)(t)^2)-2*a(t)^2*D(phi)(t)^6*(-D(N)(t)*D(phi)(t)+(D@@2)(phi)(t)
*N(t))^2*D(A5)(-1/N(t)^2*D(phi)(t)^2)+6*N(t)^8*(((2*a(t)*(D@@2)(a)(t)+2*D(a)(t)
^2)*D(phi)(t)^2-2*(D@@2)(phi)(t)*D(a)(t)*a(t)*D(phi)(t))*D(F)(-1/N(t)^2*D(phi)(
t)^2)+1/6*P(-1/N(t)^2*D(phi)(t)^2)*N(t)^4*a(t)^2+1/3*N(t)^2*D(phi)(t)^2*a(t)^2*
D(P)(-1/N(t)^2*D(phi)(t)^2)-D(phi)(t)^3*a(t)*D(a)(t)*D(Q)(-1/N(t)^2*D(phi)(t)^2
)+N(t)^2*D(a)(t)^2*F(-1/N(t)^2*D(phi)(t)^2)))/N(t)^12/a(t)^2;
E2 := 3*(-2*N(t)^4*(((D(phi)(t)*(D@@3)(phi)(t)+1/2*(D@@2)(phi)(t)^2)*a(t)^2+3*(
2*D(phi)(t)*(D@@2)(phi)(t)*D(a)(t)+D(phi)(t)^2*(D@@2)(a)(t))*a(t)+3/2*D(phi)(t)
^2*D(a)(t)^2)*N(t)^2+((-4*D(phi)(t)*D(N)(t)*(D@@2)(phi)(t)-D(phi)(t)^2*(D@@2)(N
)(t))*a(t)^2-9*a(t)*D(N)(t)*D(a)(t)*D(phi)(t)^2)*N(t)+7/2*D(phi)(t)^2*a(t)^2*D(
N)(t)^2)*A2(-1/N(t)^2*D(phi)(t)^2)-4*(((D(phi)(t)*(D@@3)(phi)(t)+(D@@2)(phi)(t)
^2)*a(t)+2*D(phi)(t)*(D@@2)(phi)(t)*D(a)(t))*N(t)^2+((-5*D(phi)(t)*D(N)(t)*(D@@
2)(phi)(t)-D(phi)(t)^2*(D@@2)(N)(t))*a(t)-2*D(N)(t)*D(a)(t)*D(phi)(t)^2)*N(t)+4
*a(t)*D(N)(t)^2*D(phi)(t)^2)*N(t)^4*a(t)*D(F)(-1/N(t)^2*D(phi)(t)^2)+N(t)^4*(((
D@@2)(phi)(t)^2*a(t)^2+2*(-2*D(phi)(t)*(D@@2)(phi)(t)*D(a)(t)-D(phi)(t)^2*(D@@2
)(a)(t))*a(t)-D(phi)(t)^2*D(a)(t)^2)*N(t)^2-2*a(t)*D(N)(t)*D(phi)(t)*((D@@2)(
phi)(t)*a(t)-3*D(a)(t)*D(phi)(t))*N(t)+D(phi)(t)^2*a(t)^2*D(N)(t)^2)*A1(-1/N(t)
^2*D(phi)(t)^2)+4*N(t)^2*(((D@@2)(phi)(t)*a(t)+3*D(a)(t)*D(phi)(t))*N(t)-D(phi)
(t)*a(t)*D(N)(t))*D(phi)(t)^2*(-D(N)(t)*D(phi)(t)+(D@@2)(phi)(t)*N(t))*a(t)*D(
A2)(-1/N(t)^2*D(phi)(t)^2)+((D(phi)(t)*(D@@3)(phi)(t)+2*(D@@2)(phi)(t)^2)*N(t)^
2+(-7*D(phi)(t)*D(N)(t)*(D@@2)(phi)(t)-D(phi)(t)^2*(D@@2)(N)(t))*N(t)+5*D(phi)(
t)^2*D(N)(t)^2)*N(t)^2*D(phi)(t)^2*a(t)^2*A3(-1/N(t)^2*D(phi)(t)^2)+8*a(t)^2*D(
phi)(t)^2*N(t)^2*(-D(N)(t)*D(phi)(t)+(D@@2)(phi)(t)*N(t))^2*(D@@2)(F)(-1/N(t)^2
*D(phi)(t)^2)-2*D(phi)(t)^4*a(t)^2*(-D(N)(t)*D(phi)(t)+(D@@2)(phi)(t)*N(t))^2*D
(A3)(-1/N(t)^2*D(phi)(t)^2)-N(t)^2*a(t)^2*D(phi)(t)^2*(-D(N)(t)*D(phi)(t)+(D@@2
)(phi)(t)*N(t))^2*A4(-1/N(t)^2*D(phi)(t)^2)+a(t)^2*D(phi)(t)^4*(-D(N)(t)*D(phi)
(t)+(D@@2)(phi)(t)*N(t))^2*A5(-1/N(t)^2*D(phi)(t)^2)+4*N(t)^3*(N(t)^4*((a(t)*(D
@@2)(a)(t)+1/2*D(a)(t)^2)*N(t)-a(t)*D(N)(t)*D(a)(t))*F(-1/N(t)^2*D(phi)(t)^2)+1
/4*(4*D(a)(t)*D(phi)(t)^3*(-D(N)(t)*D(phi)(t)+(D@@2)(phi)(t)*N(t))*D(A1)(-1/N(t
)^2*D(phi)(t)^2)+N(t)^2*(2*(-N(t)*D(phi)(t)^2*(D@@2)(phi)(t)+D(N)(t)*D(phi)(t)^
3)*D(Q)(-1/N(t)^2*D(phi)(t)^2)+P(-1/N(t)^2*D(phi)(t)^2)*N(t)^5)*a(t))*a(t)))/a(
t)^2/N(t)^10;
az1 := 1/2*(-15*(-2/15*N(t)^2*diff(diff(dphi(t,x),t),t)^2*a(t)^4-12/5*a(t)^2*N(
t)*(-1/9*diff(diff(dphi(t,x),x),x)*N(t)^3+1/3*(zet(t,x)-alpha(t,x))*a(t)^2*diff
(diff(phi(t),t),t)*N(t)+1/3*(-1/3*diff(N(t),t)*a(t)^2+diff(a(t),t)*N(t)*a(t))*
diff(dphi(t,x),t)+diff(phi(t),t)*(-1/9*diff(alpha(t,x),t)*N(t)*a(t)^2+1/3*diff(
zet(t,x),t)*N(t)*a(t)^2-1/3*(zet(t,x)-alpha(t,x))*a(t)^2*diff(N(t),t)+((zet(t,x
)-alpha(t,x))*a(t)*diff(a(t),t)-1/9*D[2,2](chi)(t,x)*N(t))*N(t)))*diff(diff(
dphi(t,x),t),t)-2/15*N(t)^6*diff(diff(dphi(t,x),x),x)^2+4/5*(1/3*(zet(t,x)-
alpha(t,x))*a(t)^2*diff(diff(phi(t),t),t)*N(t)+a(t)*(-1/3*diff(N(t),t)*a(t)+
diff(a(t),t)*N(t))*diff(dphi(t,x),t)+(-1/3*diff(alpha(t,x),t)*N(t)*a(t)^2+diff(
zet(t,x),t)*N(t)*a(t)^2-1/3*(zet(t,x)-alpha(t,x))*a(t)^2*diff(N(t),t)+((zet(t,x
)-alpha(t,x))*a(t)*diff(a(t),t)-1/3*D[2,2](chi)(t,x)*N(t))*N(t))*diff(phi(t),t)
)*N(t)^3*diff(diff(dphi(t,x),x),x)+8/5*a(t)*(1/3*diff(diff(phi(t),t),t)*N(t)*a(
t)+(-1/3*diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*diff(phi(t),t))*D[2](chi)(t,x)*N(
t)^2*diff(diff(dphi(t,x),t),x)+1/5*a(t)^2*N(t)^2*(-a(t)^2*zet(t,x)^2+6*alpha(t,
x)*a(t)^2*zet(t,x)-5*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*diff(diff(phi(t),t),
t)^2+14/15*(-18/7*a(t)*(-1/9*diff(alpha(t,x),t)*N(t)*a(t)^2+1/3*diff(zet(t,x),t
)*N(t)*a(t)^2-1/3*(zet(t,x)-alpha(t,x))*a(t)^2*diff(N(t),t)+((zet(t,x)-alpha(t,
x))*a(t)*diff(a(t),t)-1/9*D[2,2](chi)(t,x)*N(t))*N(t))*diff(dphi(t,x),t)+2/7*N(
t)^2*(diff(zet(t,x),x)*a(t)*N(t)+diff(alpha(t,x),x)*a(t)*N(t)+diff(a(t),t)*D[2]
(chi)(t,x)+a(t)*D[1,2](chi)(t,x))*diff(dphi(t,x),x)+diff(phi(t),t)*(6/7*(zet(t,
x)-5/3*alpha(t,x))*a(t)^3*N(t)*diff(alpha(t,x),t)-6/7*N(t)*a(t)^3*(zet(t,x)-3*
alpha(t,x))*diff(zet(t,x),t)-2/7*N(t)^2*a(t)*diff(alpha(t,x),x)*D[2](chi)(t,x)+
2/7*N(t)^2*a(t)*diff(zet(t,x),x)*D[2](chi)(t,x)-3/7*a(t)*(-a(t)^2*zet(t,x)^2+6*
alpha(t,x)*a(t)^2*zet(t,x)-5*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*diff(N(t),t)
+((54/7*alpha(t,x)*a(t)^2*zet(t,x)-9/7*a(t)^2*zet(t,x)^2+D[2](chi)(t,x)^2-45/7*
a(t)^2*alpha(t,x)^2)*diff(a(t),t)+2/7*a(t)*(N(t)*D[2,2](chi)(t,x)*zet(t,x)-3*N(
t)*D[2,2](chi)(t,x)*alpha(t,x)+D[2](chi)(t,x)*D[1,2](chi)(t,x)))*N(t)))*a(t)*N(
t)*diff(diff(phi(t),t),t)-6/5*a(t)^2*(-1/3*diff(N(t),t)*a(t)+diff(a(t),t)*N(t))
^2*diff(dphi(t,x),t)^2-36/5*a(t)*(-1/3*diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*
diff(phi(t),t)*(-2/9*diff(alpha(t,x),t)*N(t)*a(t)^2+2/3*diff(zet(t,x),t)*N(t)*a
(t)^2+(-2/9*D[2,2](chi)(t,x)*N(t)+(zet(t,x)-alpha(t,x))*a(t)*diff(a(t),t))*N(t)
-1/3*(zet(t,x)-alpha(t,x))*a(t)^2*diff(N(t),t))*diff(dphi(t,x),t)+(4/5*(diff(
zet(t,x),x)*a(t)*N(t)+diff(alpha(t,x),x)*a(t)*N(t)+diff(a(t),t)*D[2](chi)(t,x)+
a(t)*D[1,2](chi)(t,x))*(-1/3*diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*N(t)^2*diff(
dphi(t,x),x)+(-2/15*N(t)^2*diff(alpha(t,x),t)^2*a(t)^4+12/5*a(t)^2*(1/3*diff(
zet(t,x),t)*N(t)*a(t)^2-1/3*(zet(t,x)-5/3*alpha(t,x))*diff(N(t),t)*a(t)^2+((zet
(t,x)-5/3*alpha(t,x))*diff(a(t),t)*a(t)-1/9*D[2,2](chi)(t,x)*N(t))*N(t))*N(t)*
diff(alpha(t,x),t)-6/5*N(t)^2*diff(zet(t,x),t)^2*a(t)^4-12/5*a(t)^2*N(t)*(-1/3*
a(t)^2*(zet(t,x)-3*alpha(t,x))*diff(N(t),t)+N(t)*(a(t)*(zet(t,x)-3*alpha(t,x))*
diff(a(t),t)-1/3*D[2,2](chi)(t,x)*N(t)))*diff(zet(t,x),t)-4/5*a(t)*(-1/3*diff(N
(t),t)*a(t)+diff(a(t),t)*N(t))*D[2](chi)(t,x)*N(t)^2*diff(alpha(t,x),x)+4/5*a(t
)*(-1/3*diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*D[2](chi)(t,x)*N(t)^2*diff(zet(t,x
),x)+1/5*a(t)^2*(-a(t)^2*zet(t,x)^2+6*alpha(t,x)*a(t)^2*zet(t,x)-5*a(t)^2*alpha
(t,x)^2+D[2](chi)(t,x)^2)*diff(N(t),t)^2-14/15*a(t)*((54/7*alpha(t,x)*a(t)^2*
zet(t,x)-9/7*a(t)^2*zet(t,x)^2+D[2](chi)(t,x)^2-45/7*a(t)^2*alpha(t,x)^2)*diff(
a(t),t)+2/7*a(t)*(N(t)*D[2,2](chi)(t,x)*zet(t,x)-3*N(t)*D[2,2](chi)(t,x)*alpha(
t,x)+D[2](chi)(t,x)*D[1,2](chi)(t,x)))*N(t)*diff(N(t),t)+((D[2](chi)(t,x)^2-9/5
*a(t)^2*zet(t,x)^2-9*a(t)^2*alpha(t,x)^2+54/5*alpha(t,x)*a(t)^2*zet(t,x))*diff(
a(t),t)^2+4/5*a(t)*(N(t)*D[2,2](chi)(t,x)*zet(t,x)-3*N(t)*D[2,2](chi)(t,x)*
alpha(t,x)+D[2](chi)(t,x)*D[1,2](chi)(t,x))*diff(a(t),t)-2/15*N(t)^2*D[2,2](chi
)(t,x)^2)*N(t)^2)*diff(phi(t),t))*diff(phi(t),t))*N(t)^8*A2(-diff(phi(t),t)^2/N
(t)^2)-6*(1/3*diff(phi(t),t)^2*a(t)^4*N(t)^2*diff(diff(dphi(t,x),t),t)^2+3*a(t)
^2*diff(phi(t),t)*(-1/9*diff(phi(t),t)*N(t)^3*diff(diff(dphi(t,x),x),x)+2/3*((
zet(t,x)-5/3*alpha(t,x))*diff(phi(t),t)+2/3*diff(dphi(t,x),t))*a(t)^2*N(t)*diff
(diff(phi(t),t),t)+((-2/3*diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*diff(dphi(t,x),t
)*a(t)+(-2/9*diff(alpha(t,x),t)*N(t)*a(t)^2+1/3*diff(zet(t,x),t)*N(t)*a(t)^2-2/
3*(zet(t,x)-5/3*alpha(t,x))*diff(N(t),t)*a(t)^2+((zet(t,x)-5/3*alpha(t,x))*diff
(a(t),t)*a(t)-1/9*D[2,2](chi)(t,x)*N(t))*N(t))*diff(phi(t),t))*diff(phi(t),t))*
N(t)*diff(diff(dphi(t,x),t),t)+1/3*a(t)^2*(-(2*diff(dphi(t,x),t)+diff(phi(t),t)
*(zet(t,x)-3*alpha(t,x)))*N(t)*diff(diff(phi(t),t),t)+(3*diff(N(t),t)*diff(dphi
(t,x),t)+(diff(alpha(t,x),t)*N(t)+diff(N(t),t)*(zet(t,x)-3*alpha(t,x)))*diff(
phi(t),t))*diff(phi(t),t))*diff(phi(t),t)*N(t)^3*diff(diff(dphi(t,x),x),x)-2*a(
t)*diff(phi(t),t)*N(t)^2*(2/3*a(t)*(diff(phi(t),t)*D[2](chi)(t,x)+1/2*diff(dphi
(t,x),x)*N(t))*N(t)*diff(diff(phi(t),t),t)+(N(t)*(-1/3*diff(N(t),t)*a(t)+diff(a
(t),t)*N(t))*diff(dphi(t,x),x)+diff(phi(t),t)*D[2](chi)(t,x)*(-2/3*diff(N(t),t)
*a(t)+diff(a(t),t)*N(t)))*diff(phi(t),t))*diff(diff(dphi(t,x),t),x)-5/6*a(t)^2*
(-2/5*diff(dphi(t,x),t)^2*a(t)^2-12/5*(zet(t,x)-5/3*alpha(t,x))*a(t)^2*diff(phi
(t),t)*diff(dphi(t,x),t)+diff(phi(t),t)*(4/5*diff(dphi(t,x),x)*D[2](chi)(t,x)*N
(t)+diff(phi(t),t)*(-3/5*a(t)^2*zet(t,x)^2+6*alpha(t,x)*a(t)^2*zet(t,x)-7*a(t)^
2*alpha(t,x)^2+D[2](chi)(t,x)^2)))*N(t)^2*diff(diff(phi(t),t),t)^2-11/6*(6/11*(
-3*diff(a(t),t)*a(t)^2*N(t)+2*diff(N(t),t)*a(t)^3)*diff(dphi(t,x),t)^2-54/11*(-\
2/9*diff(alpha(t,x),t)*N(t)*a(t)^2+1/3*diff(zet(t,x),t)*N(t)*a(t)^2-2/3*(zet(t,
x)-5/3*alpha(t,x))*diff(N(t),t)*a(t)^2+((zet(t,x)-5/3*alpha(t,x))*diff(a(t),t)*
a(t)-1/9*D[2,2](chi)(t,x)*N(t))*N(t))*a(t)*diff(phi(t),t)*diff(dphi(t,x),t)-2/
11*N(t)^3*diff(a(t),t)*diff(dphi(t,x),x)^2+10/11*diff(phi(t),t)*(1/5*a(t)*N(t)^
2*diff(zet(t,x),x)-4/5*a(t)*diff(N(t),t)*D[2](chi)(t,x)+N(t)*(diff(a(t),t)*D[2]
(chi)(t,x)+2/5*a(t)*D[1,2](chi)(t,x)))*N(t)*diff(dphi(t,x),x)+(12/11*(zet(t,x)-\
7/3*alpha(t,x))*a(t)^3*N(t)*diff(alpha(t,x),t)-6/11*N(t)*a(t)^3*(zet(t,x)-5*
alpha(t,x))*diff(zet(t,x),t)-4/11*N(t)^2*a(t)*diff(alpha(t,x),x)*D[2](chi)(t,x)
+2/11*N(t)^2*a(t)*diff(zet(t,x),x)*D[2](chi)(t,x)-10/11*(-3/5*a(t)^2*zet(t,x)^2
+6*alpha(t,x)*a(t)^2*zet(t,x)-7*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*a(t)*diff
(N(t),t)+((90/11*alpha(t,x)*a(t)^2*zet(t,x)+D[2](chi)(t,x)^2-9/11*a(t)^2*zet(t,
x)^2-105/11*a(t)^2*alpha(t,x)^2)*diff(a(t),t)+4/11*a(t)*(1/2*N(t)*D[2,2](chi)(t
,x)*zet(t,x)-5/2*N(t)*D[2,2](chi)(t,x)*alpha(t,x)+D[2](chi)(t,x)*D[1,2](chi)(t,
x)))*N(t))*diff(phi(t),t)^2)*a(t)*diff(phi(t),t)*N(t)*diff(diff(phi(t),t),t)+(2
*(-3*N(t)*diff(N(t),t)*a(t)^3*diff(a(t),t)+a(t)^4*diff(N(t),t)^2)*diff(dphi(t,x
),t)^2-4*a(t)^2*diff(phi(t),t)*((-2/3*diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*diff
(alpha(t,x),t)*a(t)*N(t)+3*(1/3*diff(zet(t,x),t)*N(t)*a(t)^2-1/3*(zet(t,x)-5/3*
alpha(t,x))*diff(N(t),t)*a(t)^2+((zet(t,x)-5/3*alpha(t,x))*diff(a(t),t)*a(t)-1/
9*D[2,2](chi)(t,x)*N(t))*N(t))*diff(N(t),t))*diff(dphi(t,x),t)+diff(a(t),t)*N(t
)^3*(-1/3*diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*diff(dphi(t,x),x)^2+2*diff(phi(t
),t)*(1/2*N(t)^3*a(t)*diff(a(t),t)*diff(alpha(t,x),x)+1/6*N(t)^2*diff(N(t),t)*a
(t)^2*diff(zet(t,x),x)-1/3*diff(N(t),t)^2*a(t)^2*D[2](chi)(t,x)+5/6*a(t)*(diff(
a(t),t)*D[2](chi)(t,x)+2/5*a(t)*D[1,2](chi)(t,x))*N(t)*diff(N(t),t)+diff(a(t),t
)*N(t)^2*(diff(a(t),t)*D[2](chi)(t,x)-1/2*a(t)*D[1,2](chi)(t,x)))*N(t)*diff(
dphi(t,x),x)+diff(phi(t),t)^2*(1/3*N(t)^2*diff(alpha(t,x),t)^2*a(t)^4-3*(1/3*
diff(zet(t,x),t)*N(t)*a(t)^2-2/3*(zet(t,x)-7/3*alpha(t,x))*a(t)^2*diff(N(t),t)+
(a(t)*(zet(t,x)-7/3*alpha(t,x))*diff(a(t),t)-1/9*D[2,2](chi)(t,x)*N(t))*N(t))*a
(t)^2*N(t)*diff(alpha(t,x),t)-N(t)*diff(N(t),t)*a(t)^4*(zet(t,x)-5*alpha(t,x))*
diff(zet(t,x),t)+N(t)^2*a(t)*D[2](chi)(t,x)*(-2/3*diff(N(t),t)*a(t)+diff(a(t),t
)*N(t))*diff(alpha(t,x),x)+1/3*N(t)^2*diff(N(t),t)*a(t)^2*diff(zet(t,x),x)*D[2]
(chi)(t,x)-5/6*(-3/5*a(t)^2*zet(t,x)^2+6*alpha(t,x)*a(t)^2*zet(t,x)-7*a(t)^2*
alpha(t,x)^2+D[2](chi)(t,x)^2)*a(t)^2*diff(N(t),t)^2+11/6*((90/11*alpha(t,x)*a(
t)^2*zet(t,x)+D[2](chi)(t,x)^2-9/11*a(t)^2*zet(t,x)^2-105/11*a(t)^2*alpha(t,x)^
2)*diff(a(t),t)+4/11*a(t)*(1/2*N(t)*D[2,2](chi)(t,x)*zet(t,x)-5/2*N(t)*D[2,2](
chi)(t,x)*alpha(t,x)+D[2](chi)(t,x)*D[1,2](chi)(t,x)))*a(t)*N(t)*diff(N(t),t)+N
(t)^2*diff(a(t),t)*D[2](chi)(t,x)*(diff(a(t),t)*D[2](chi)(t,x)-a(t)*D[1,2](chi)
(t,x))))*diff(phi(t),t)^2)*N(t)^6*A3(-diff(phi(t),t)^2/N(t)^2)+18*(4/3*diff(phi
(t),t)*a(t)^3*N(t)*(alpha(t,x)*diff(phi(t),t)-diff(dphi(t,x),t))*diff(diff(dphi
(t,x),t),t)-4/3*diff(phi(t),t)*a(t)*N(t)^3*(alpha(t,x)*diff(phi(t),t)-diff(dphi
(t,x),t))*diff(diff(dphi(t,x),x),x)+1/3*a(t)*(-diff(dphi(t,x),t)^2*a(t)^2-6*(
zet(t,x)-5/3*alpha(t,x))*a(t)^2*diff(phi(t),t)*diff(dphi(t,x),t)+diff(dphi(t,x)
,x)^2*N(t)^2+2*diff(phi(t),t)*N(t)*diff(dphi(t,x),x)*D[2](chi)(t,x)+diff(phi(t)
,t)^2*(6*alpha(t,x)*a(t)^2*zet(t,x)-10*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2))*N
(t)*diff(diff(phi(t),t),t)+(5*(1/3*diff(N(t),t)*a(t)^3-diff(a(t),t)*a(t)^2*N(t)
)*diff(dphi(t,x),t)^2-6*a(t)*(-2/9*diff(alpha(t,x),t)*N(t)*a(t)^2+2/3*diff(zet(
t,x),t)*N(t)*a(t)^2-1/3*(zet(t,x)-7/3*alpha(t,x))*a(t)^2*diff(N(t),t)+(a(t)*(
zet(t,x)-7/3*alpha(t,x))*diff(a(t),t)-2/9*D[2,2](chi)(t,x)*N(t))*N(t))*diff(phi
(t),t)*diff(dphi(t,x),t)+N(t)^2*(-1/3*diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*diff
(dphi(t,x),x)^2+2*(-1/3*diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*D[2](chi)(t,x)*
diff(phi(t),t)*N(t)*diff(dphi(t,x),x)+diff(phi(t),t)^2*(-4/3*N(t)*diff(alpha(t,
x),t)*a(t)^3*alpha(t,x)+4*a(t)^3*N(t)*diff(zet(t,x),t)*alpha(t,x)-1/3*a(t)*(6*
alpha(t,x)*a(t)^2*zet(t,x)-10*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*diff(N(t),t
)+((6*alpha(t,x)*a(t)^2*zet(t,x)-10*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*diff(
a(t),t)-4/3*alpha(t,x)*D[2,2](chi)(t,x)*a(t)*N(t))*N(t)))*diff(phi(t),t))*(1/3*
diff(diff(phi(t),t),t)*N(t)*a(t)+(-1/3*diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*
diff(phi(t),t))*N(t)^6*D(A2)(-diff(phi(t),t)^2/N(t)^2)-9*(-2/9*N(t)^2*diff(diff
(dphi(t,x),t),t)^2*a(t)^4+4/9*a(t)^4*(-3*N(t)*(zet(t,x)-alpha(t,x))*diff(diff(
phi(t),t),t)+diff(N(t),t)*diff(dphi(t,x),t)+(diff(alpha(t,x),t)*N(t)+3*(zet(t,x
)-alpha(t,x))*diff(N(t),t))*diff(phi(t),t))*N(t)*diff(diff(dphi(t,x),t),t)-2/9*
N(t)^6*diff(diff(dphi(t,x),x),x)^2+4/9*(a(t)*diff(a(t),t)*diff(dphi(t,x),t)+(a(
t)^2*diff(zet(t,x),t)+(zet(t,x)-alpha(t,x))*a(t)*diff(a(t),t)-D[2,2](chi)(t,x)*
N(t))*diff(phi(t),t))*N(t)^4*diff(diff(dphi(t,x),x),x)+4/9*N(t)^4*a(t)^2*diff(
diff(dphi(t,x),t),x)^2-8/9*a(t)*(-a(t)*N(t)*diff(diff(phi(t),t),t)*D[2](chi)(t,
x)+diff(a(t),t)*diff(dphi(t,x),x)*N(t)^2+diff(phi(t),t)*a(t)*(N(t)^2*diff(alpha
(t,x),x)+diff(N(t),t)*D[2](chi)(t,x)))*N(t)^2*diff(diff(dphi(t,x),t),x)+1/3*a(t
)^2*N(t)^2*(-a(t)^2*zet(t,x)^2+6*alpha(t,x)*a(t)^2*zet(t,x)-5*a(t)^2*alpha(t,x)
^2+D[2](chi)(t,x)^2)*diff(diff(phi(t),t),t)^2-4/9*a(t)*(-a(t)^3*(diff(alpha(t,x
),t)*N(t)+3*(zet(t,x)-alpha(t,x))*diff(N(t),t))*diff(dphi(t,x),t)+(-N(t)^3*a(t)
*diff(alpha(t,x),x)+2*N(t)^2*diff(a(t),t)*D[2](chi)(t,x)-N(t)^2*a(t)*D[1,2](chi
)(t,x))*diff(dphi(t,x),x)+(-3*(zet(t,x)-5/3*alpha(t,x))*a(t)^3*N(t)*diff(alpha(
t,x),t)+N(t)^2*a(t)*diff(alpha(t,x),x)*D[2](chi)(t,x)+3/2*a(t)*(-a(t)^2*zet(t,x
)^2+6*alpha(t,x)*a(t)^2*zet(t,x)-5*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*diff(N
(t),t)+N(t)*D[2](chi)(t,x)*(diff(a(t),t)*D[2](chi)(t,x)-a(t)*D[1,2](chi)(t,x)))
*diff(phi(t),t))*N(t)*diff(diff(phi(t),t),t)+2/3*(-N(t)^2*a(t)^2*diff(a(t),t)^2
-1/3*a(t)^4*diff(N(t),t)^2)*diff(dphi(t,x),t)^2-4*a(t)*diff(phi(t),t)*(2/3*a(t)
^2*diff(zet(t,x),t)*diff(a(t),t)*N(t)^2+(-2/9*D[2,2](chi)(t,x)*N(t)+(zet(t,x)-
alpha(t,x))*a(t)*diff(a(t),t))*diff(a(t),t)*N(t)^2+2/9*a(t)^3*diff(alpha(t,x),t
)*diff(N(t),t)*N(t)+1/3*(zet(t,x)-alpha(t,x))*a(t)^3*diff(N(t),t)^2)*diff(dphi(
t,x),t)+4/9*N(t)^4*diff(a(t),t)^2*diff(dphi(t,x),x)^2+4/3*(1/3*(2*diff(a(t),t)*
a(t)*N(t)^2-a(t)^2*diff(N(t),t)*N(t))*diff(alpha(t,x),x)+1/3*N(t)^2*a(t)*diff(a
(t),t)*diff(zet(t,x),x)+1/3*(2*diff(a(t),t)*a(t)*D[2](chi)(t,x)-a(t)^2*D[1,2](
chi)(t,x))*diff(N(t),t)+N(t)*diff(a(t),t)^2*D[2](chi)(t,x))*diff(phi(t),t)*N(t)
^2*diff(dphi(t,x),x)+diff(phi(t),t)^2*(-2/9*N(t)^2*diff(alpha(t,x),t)^2*a(t)^4-\
4/3*(zet(t,x)-5/3*alpha(t,x))*a(t)^4*N(t)*diff(N(t),t)*diff(alpha(t,x),t)-2/3*N
(t)^2*diff(zet(t,x),t)^2*a(t)^4-4/3*a(t)^2*N(t)^2*(a(t)*(zet(t,x)-3*alpha(t,x))
*diff(a(t),t)-1/3*D[2,2](chi)(t,x)*N(t))*diff(zet(t,x),t)+4/9*N(t)^4*a(t)^2*
diff(alpha(t,x),x)^2+4/9*N(t)^2*diff(N(t),t)*a(t)^2*diff(alpha(t,x),x)*D[2](chi
)(t,x)+4/9*N(t)^3*a(t)*diff(a(t),t)*diff(zet(t,x),x)*D[2](chi)(t,x)+1/3*a(t)^2*
(-a(t)^2*zet(t,x)^2+6*alpha(t,x)*a(t)^2*zet(t,x)-5*a(t)^2*alpha(t,x)^2+D[2](chi
)(t,x)^2)*diff(N(t),t)^2+4/9*D[2](chi)(t,x)*N(t)*a(t)*(diff(a(t),t)*D[2](chi)(t
,x)-a(t)*D[1,2](chi)(t,x))*diff(N(t),t)+((-a(t)^2*zet(t,x)^2+6*alpha(t,x)*a(t)^
2*zet(t,x)-5*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*diff(a(t),t)^2+4/9*a(t)*N(t)
*D[2,2](chi)(t,x)*(zet(t,x)-3*alpha(t,x))*diff(a(t),t)-2/9*N(t)^2*D[2,2](chi)(t
,x)^2)*N(t)^2))*N(t)^8*A1(-diff(phi(t),t)^2/N(t)^2)+6*a(t)*diff(phi(t),t)^2*(-2
*(alpha(t,x)*diff(phi(t),t)-diff(dphi(t,x),t))*a(t)^2*diff(phi(t),t)*N(t)*(2/3*
diff(diff(phi(t),t),t)*N(t)*a(t)+(-2/3*diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*
diff(phi(t),t))*diff(diff(dphi(t,x),t),t)-2/3*diff(phi(t),t)*a(t)*N(t)^3*(-diff
(diff(phi(t),t),t)*N(t)+diff(N(t),t)*diff(phi(t),t))*(alpha(t,x)*diff(phi(t),t)
-diff(dphi(t,x),t))*diff(diff(dphi(t,x),x),x)-1/3*a(t)*(-5*diff(dphi(t,x),t)^2*
a(t)^2-6*a(t)^2*diff(phi(t),t)*(zet(t,x)-3*alpha(t,x))*diff(dphi(t,x),t)+diff(
dphi(t,x),x)^2*N(t)^2+2*diff(phi(t),t)*N(t)*diff(dphi(t,x),x)*D[2](chi)(t,x)+
diff(phi(t),t)^2*(6*alpha(t,x)*a(t)^2*zet(t,x)-14*a(t)^2*alpha(t,x)^2+D[2](chi)
(t,x)^2))*N(t)^2*diff(diff(phi(t),t),t)^2-(7*(-diff(a(t),t)*a(t)^2*N(t)+2/3*
diff(N(t),t)*a(t)^3)*diff(dphi(t,x),t)^2-6*a(t)*diff(phi(t),t)*(-2/9*diff(alpha
(t,x),t)*N(t)*a(t)^2+1/3*diff(zet(t,x),t)*N(t)*a(t)^2-2/3*(zet(t,x)-10/3*alpha(
t,x))*a(t)^2*diff(N(t),t)+(a(t)*(zet(t,x)-10/3*alpha(t,x))*diff(a(t),t)-1/9*D[2
,2](chi)(t,x)*N(t))*N(t))*diff(dphi(t,x),t)+N(t)^2*(-2/3*diff(N(t),t)*a(t)+diff
(a(t),t)*N(t))*diff(dphi(t,x),x)^2+2*(-2/3*diff(N(t),t)*a(t)+diff(a(t),t)*N(t))
*D[2](chi)(t,x)*diff(phi(t),t)*N(t)*diff(dphi(t,x),x)+diff(phi(t),t)^2*(-4/3*N(
t)*diff(alpha(t,x),t)*a(t)^3*alpha(t,x)+2*a(t)^3*N(t)*diff(zet(t,x),t)*alpha(t,
x)-2/3*a(t)*(6*alpha(t,x)*a(t)^2*zet(t,x)-14*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)
^2)*diff(N(t),t)+((6*alpha(t,x)*a(t)^2*zet(t,x)-14*a(t)^2*alpha(t,x)^2+D[2](chi
)(t,x)^2)*diff(a(t),t)-2/3*alpha(t,x)*D[2,2](chi)(t,x)*a(t)*N(t))*N(t)))*diff(
phi(t),t)*N(t)*diff(diff(phi(t),t),t)+(3*(-3*diff(a(t),t)*N(t)*a(t)^2*diff(N(t)
,t)+a(t)^3*diff(N(t),t)^2)*diff(dphi(t,x),t)^2-2*a(t)*diff(phi(t),t)*((-2/3*
diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*diff(alpha(t,x),t)*a(t)*N(t)+3*(1/3*diff(
zet(t,x),t)*N(t)*a(t)^2-1/3*a(t)^2*(zet(t,x)-11/3*alpha(t,x))*diff(N(t),t)+(a(t
)*(zet(t,x)-11/3*alpha(t,x))*diff(a(t),t)-1/9*D[2,2](chi)(t,x)*N(t))*N(t))*diff
(N(t),t))*diff(dphi(t,x),t)+N(t)^2*diff(N(t),t)*(-1/3*diff(N(t),t)*a(t)+diff(a(
t),t)*N(t))*diff(dphi(t,x),x)^2+2*(-1/3*diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*D[
2](chi)(t,x)*diff(phi(t),t)*N(t)*diff(N(t),t)*diff(dphi(t,x),x)+diff(phi(t),t)^
2*(2*a(t)^2*(-2/3*diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*N(t)*alpha(t,x)*diff(
alpha(t,x),t)+(2*a(t)^3*N(t)*diff(zet(t,x),t)*alpha(t,x)-1/3*a(t)*(6*alpha(t,x)
*a(t)^2*zet(t,x)-14*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*diff(N(t),t)+((6*
alpha(t,x)*a(t)^2*zet(t,x)-14*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*diff(a(t),t
)-2/3*alpha(t,x)*D[2,2](chi)(t,x)*a(t)*N(t))*N(t))*diff(N(t),t)))*diff(phi(t),t
)^2)*N(t)^4*D(A3)(-diff(phi(t),t)^2/N(t)^2)+4*(-1/2*diff(phi(t),t)^2*a(t)^3*N(t
)^2*diff(diff(dphi(t,x),t),t)^2+a(t)^3*(-3*((zet(t,x)-5/3*alpha(t,x))*diff(phi(
t),t)+2/3*diff(dphi(t,x),t))*diff(diff(phi(t),t),t)*N(t)+diff(phi(t),t)*(3*diff
(N(t),t)*diff(dphi(t,x),t)+(diff(alpha(t,x),t)*N(t)+3*(zet(t,x)-5/3*alpha(t,x))
*diff(N(t),t))*diff(phi(t),t)))*diff(phi(t),t)*N(t)*diff(diff(dphi(t,x),t),t)+1
/2*a(t)*N(t)^4*diff(phi(t),t)^2*diff(diff(dphi(t,x),t),x)^2-2*((-diff(phi(t),t)
*D[2](chi)(t,x)*N(t)-1/2*diff(dphi(t,x),x)*N(t)^2)*diff(diff(phi(t),t),t)+(1/2*
diff(dphi(t,x),x)*N(t)*diff(N(t),t)+diff(phi(t),t)*(1/2*N(t)^2*diff(alpha(t,x),
x)+diff(N(t),t)*D[2](chi)(t,x)))*diff(phi(t),t))*a(t)*diff(phi(t),t)*N(t)^2*
diff(diff(dphi(t,x),t),x)+5/4*a(t)*(-2/5*diff(dphi(t,x),t)^2*a(t)^2-12/5*(zet(t
,x)-5/3*alpha(t,x))*a(t)^2*diff(phi(t),t)*diff(dphi(t,x),t)+diff(phi(t),t)*(4/5
*diff(dphi(t,x),x)*D[2](chi)(t,x)*N(t)+diff(phi(t),t)*(-3/5*a(t)^2*zet(t,x)^2+6
*alpha(t,x)*a(t)^2*zet(t,x)-7*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)))*N(t)^2*
diff(diff(phi(t),t),t)^2-(-3*a(t)^3*diff(N(t),t)*diff(dphi(t,x),t)^2-3*a(t)^3*(
diff(alpha(t,x),t)*N(t)+3*(zet(t,x)-5/3*alpha(t,x))*diff(N(t),t))*diff(phi(t),t
)*diff(dphi(t,x),t)+N(t)^3*diff(a(t),t)*diff(dphi(t,x),x)^2+2*(a(t)*diff(N(t),t
)*D[2](chi)(t,x)+N(t)*(diff(a(t),t)*D[2](chi)(t,x)-1/2*a(t)*D[1,2](chi)(t,x)))*
diff(phi(t),t)*N(t)*diff(dphi(t,x),x)+(-3*(zet(t,x)-7/3*alpha(t,x))*a(t)^3*N(t)
*diff(alpha(t,x),t)+N(t)^2*a(t)*diff(alpha(t,x),x)*D[2](chi)(t,x)+5/2*(-3/5*a(t
)^2*zet(t,x)^2+6*alpha(t,x)*a(t)^2*zet(t,x)-7*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x
)^2)*a(t)*diff(N(t),t)+N(t)*D[2](chi)(t,x)*(diff(a(t),t)*D[2](chi)(t,x)-a(t)*D[
1,2](chi)(t,x)))*diff(phi(t),t)^2)*diff(phi(t),t)*N(t)*diff(diff(phi(t),t),t)+
diff(phi(t),t)^2*(-3*a(t)^3*diff(N(t),t)^2*diff(dphi(t,x),t)^2-4*a(t)^3*(diff(
alpha(t,x),t)*N(t)+3/2*(zet(t,x)-5/3*alpha(t,x))*diff(N(t),t))*diff(phi(t),t)*
diff(N(t),t)*diff(dphi(t,x),t)+N(t)^3*diff(N(t),t)*diff(a(t),t)*diff(dphi(t,x),
x)^2+2*(1/2*a(t)*diff(N(t),t)*D[2](chi)(t,x)+N(t)*(diff(a(t),t)*D[2](chi)(t,x)-\
1/2*a(t)*D[1,2](chi)(t,x)))*diff(phi(t),t)*N(t)*diff(N(t),t)*diff(dphi(t,x),x)+
(-1/2*a(t)^3*N(t)^2*diff(alpha(t,x),t)^2-3*(zet(t,x)-7/3*alpha(t,x))*a(t)^3*N(t
)*diff(N(t),t)*diff(alpha(t,x),t)+1/2*a(t)*N(t)^4*diff(alpha(t,x),x)^2+a(t)*N(t
)^2*diff(N(t),t)*diff(alpha(t,x),x)*D[2](chi)(t,x)+(5/4*(-3/5*a(t)^2*zet(t,x)^2
+6*alpha(t,x)*a(t)^2*zet(t,x)-7*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*a(t)*diff
(N(t),t)+N(t)*D[2](chi)(t,x)*(diff(a(t),t)*D[2](chi)(t,x)-a(t)*D[1,2](chi)(t,x)
))*diff(N(t),t))*diff(phi(t),t)^2))*a(t)*N(t)^6*A4(-diff(phi(t),t)^2/N(t)^2)-4*
a(t)*(-1/2*diff(phi(t),t)^2*a(t)^3*N(t)^2*diff(diff(dphi(t,x),t),t)^2+a(t)^3*
diff(phi(t),t)*(-3*((zet(t,x)-7/3*alpha(t,x))*diff(phi(t),t)+4/3*diff(dphi(t,x)
,t))*diff(diff(phi(t),t),t)*N(t)+(5*diff(N(t),t)*diff(dphi(t,x),t)+(diff(alpha(
t,x),t)*N(t)+3*(zet(t,x)-7/3*alpha(t,x))*diff(N(t),t))*diff(phi(t),t))*diff(phi
(t),t))*N(t)*diff(diff(dphi(t,x),t),t)-2*diff(phi(t),t)*a(t)*N(t)^2*(-diff(diff
(phi(t),t),t)*N(t)+diff(N(t),t)*diff(phi(t),t))*(diff(dphi(t,x),x)*N(t)+diff(
phi(t),t)*D[2](chi)(t,x))*diff(diff(dphi(t,x),t),x)+7/4*a(t)*(-12/7*diff(dphi(t
,x),t)^2*a(t)^2-24/7*(zet(t,x)-7/3*alpha(t,x))*a(t)^2*diff(phi(t),t)*diff(dphi(
t,x),t)+(8/7*diff(dphi(t,x),x)*D[2](chi)(t,x)*N(t)+diff(phi(t),t)*(-3/7*a(t)^2*
zet(t,x)^2+6*alpha(t,x)*a(t)^2*zet(t,x)-9*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)
)*diff(phi(t),t))*N(t)^2*diff(diff(phi(t),t),t)^2-(-10*a(t)^3*diff(N(t),t)*diff
(dphi(t,x),t)^2-5*a(t)^3*(diff(alpha(t,x),t)*N(t)+3*(zet(t,x)-7/3*alpha(t,x))*
diff(N(t),t))*diff(phi(t),t)*diff(dphi(t,x),t)+N(t)^3*diff(a(t),t)*diff(dphi(t,
x),x)^2+2*(1/2*diff(alpha(t,x),x)*N(t)^2*a(t)+2*a(t)*diff(N(t),t)*D[2](chi)(t,x
)+N(t)*(diff(a(t),t)*D[2](chi)(t,x)-1/2*a(t)*D[1,2](chi)(t,x)))*diff(phi(t),t)*
N(t)*diff(dphi(t,x),x)+(-3*N(t)*a(t)^3*(zet(t,x)-3*alpha(t,x))*diff(alpha(t,x),
t)+N(t)^2*a(t)*diff(alpha(t,x),x)*D[2](chi)(t,x)+7/2*(-3/7*a(t)^2*zet(t,x)^2+6*
alpha(t,x)*a(t)^2*zet(t,x)-9*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*a(t)*diff(N(
t),t)+N(t)*D[2](chi)(t,x)*(diff(a(t),t)*D[2](chi)(t,x)-a(t)*D[1,2](chi)(t,x)))*
diff(phi(t),t)^2)*diff(phi(t),t)*N(t)*diff(diff(phi(t),t),t)+diff(phi(t),t)^2*(
-15/2*a(t)^3*diff(N(t),t)^2*diff(dphi(t,x),t)^2-6*a(t)^3*diff(phi(t),t)*(diff(
alpha(t,x),t)*N(t)+3/2*(zet(t,x)-7/3*alpha(t,x))*diff(N(t),t))*diff(N(t),t)*
diff(dphi(t,x),t)+N(t)^3*diff(N(t),t)*diff(a(t),t)*diff(dphi(t,x),x)^2+2*(1/2*
diff(alpha(t,x),x)*N(t)^2*a(t)+a(t)*diff(N(t),t)*D[2](chi)(t,x)+N(t)*(diff(a(t)
,t)*D[2](chi)(t,x)-1/2*a(t)*D[1,2](chi)(t,x)))*diff(phi(t),t)*N(t)*diff(N(t),t)
*diff(dphi(t,x),x)+diff(phi(t),t)^2*(-1/2*a(t)^3*N(t)^2*diff(alpha(t,x),t)^2-3*
N(t)*a(t)^3*diff(N(t),t)*(zet(t,x)-3*alpha(t,x))*diff(alpha(t,x),t)+(N(t)^2*a(t
)*diff(alpha(t,x),x)*D[2](chi)(t,x)+7/4*(-3/7*a(t)^2*zet(t,x)^2+6*alpha(t,x)*a(
t)^2*zet(t,x)-9*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*a(t)*diff(N(t),t)+N(t)*D[
2](chi)(t,x)*(diff(a(t),t)*D[2](chi)(t,x)-a(t)*D[1,2](chi)(t,x)))*diff(N(t),t))
))*diff(phi(t),t)^2*N(t)^4*A5(-diff(phi(t),t)^2/N(t)^2)+6*(-4/3*diff(phi(t),t)*
N(t)*a(t)^4*(-diff(diff(phi(t),t),t)*N(t)+diff(N(t),t)*diff(phi(t),t))*(alpha(t
,x)*diff(phi(t),t)-diff(dphi(t,x),t))*diff(diff(dphi(t,x),t),t)-4/3*a(t)*N(t)^4
*diff(phi(t),t)^2*diff(a(t),t)*(alpha(t,x)*diff(phi(t),t)-diff(dphi(t,x),t))*
diff(diff(dphi(t,x),x),x)+1/3*a(t)^2*(-diff(dphi(t,x),t)^2*a(t)^2-6*(zet(t,x)-5
/3*alpha(t,x))*a(t)^2*diff(phi(t),t)*diff(dphi(t,x),t)+diff(dphi(t,x),x)^2*N(t)
^2+2*diff(phi(t),t)*N(t)*diff(dphi(t,x),x)*D[2](chi)(t,x)+diff(phi(t),t)^2*(6*
alpha(t,x)*a(t)^2*zet(t,x)-10*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2))*N(t)^2*
diff(diff(phi(t),t),t)^2-2/3*a(t)^2*(-3*diff(dphi(t,x),t)^2*a(t)^2*diff(N(t),t)
-2*a(t)^2*diff(phi(t),t)*(diff(alpha(t,x),t)*N(t)+3*diff(N(t),t)*(zet(t,x)-2*
alpha(t,x)))*diff(dphi(t,x),t)+N(t)^2*diff(N(t),t)*diff(dphi(t,x),x)^2+2*diff(
phi(t),t)*N(t)*diff(N(t),t)*diff(dphi(t,x),x)*D[2](chi)(t,x)+diff(phi(t),t)^2*(
2*a(t)^2*N(t)*diff(alpha(t,x),t)*alpha(t,x)+diff(N(t),t)*(6*alpha(t,x)*a(t)^2*
zet(t,x)-10*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)))*diff(phi(t),t)*N(t)*diff(
diff(phi(t),t),t)+diff(phi(t),t)^2*(5*(-N(t)^2*a(t)^2*diff(a(t),t)^2-1/3*a(t)^4
*diff(N(t),t)^2)*diff(dphi(t,x),t)^2-6*(2/9*a(t)^3*diff(alpha(t,x),t)*diff(N(t)
,t)*N(t)+2/3*a(t)^2*diff(zet(t,x),t)*diff(a(t),t)*N(t)^2+1/3*(zet(t,x)-7/3*
alpha(t,x))*a(t)^3*diff(N(t),t)^2+diff(a(t),t)*(a(t)*(zet(t,x)-7/3*alpha(t,x))*
diff(a(t),t)-2/9*D[2,2](chi)(t,x)*N(t))*N(t)^2)*a(t)*diff(phi(t),t)*diff(dphi(t
,x),t)+N(t)^2*(1/3*diff(N(t),t)^2*a(t)^2+diff(a(t),t)^2*N(t)^2)*diff(dphi(t,x),
x)^2+2*(1/3*diff(N(t),t)^2*a(t)^2+diff(a(t),t)^2*N(t)^2)*D[2](chi)(t,x)*diff(
phi(t),t)*N(t)*diff(dphi(t,x),x)+diff(phi(t),t)^2*(4/3*N(t)*diff(alpha(t,x),t)*
diff(N(t),t)*a(t)^4*alpha(t,x)+4*a(t)^3*N(t)^2*diff(zet(t,x),t)*diff(a(t),t)*
alpha(t,x)+1/3*a(t)^2*(6*alpha(t,x)*a(t)^2*zet(t,x)-10*a(t)^2*alpha(t,x)^2+D[2]
(chi)(t,x)^2)*diff(N(t),t)^2+diff(a(t),t)*((6*alpha(t,x)*a(t)^2*zet(t,x)-10*a(t
)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*diff(a(t),t)-4/3*alpha(t,x)*D[2,2](chi)(t,x)
*a(t)*N(t))*N(t)^2)))*N(t)^6*D(A1)(-diff(phi(t),t)^2/N(t)^2)+12*(-2/3*diff(phi(
t),t)*N(t)^3*a(t)^2*(alpha(t,x)*diff(phi(t),t)-diff(dphi(t,x),t))*diff(diff(
alpha(t,x),x),x)+2*diff(phi(t),t)*N(t)*a(t)^4*(alpha(t,x)*diff(phi(t),t)-diff(
dphi(t,x),t))*diff(diff(zet(t,x),t),t)-4/3*diff(phi(t),t)*N(t)^3*a(t)^2*(alpha(
t,x)*diff(phi(t),t)-diff(dphi(t,x),t))*diff(diff(zet(t,x),x),x)+a(t)*(-diff(
dphi(t,x),t)^2*a(t)^2-6*a(t)^2*diff(phi(t),t)*(zet(t,x)-alpha(t,x))*diff(dphi(t
,x),t)+diff(dphi(t,x),x)^2*N(t)^2+2*diff(phi(t),t)*N(t)*diff(dphi(t,x),x)*D[2](
chi)(t,x)+diff(phi(t),t)^2*(6*alpha(t,x)*a(t)^2*zet(t,x)-6*a(t)^2*alpha(t,x)^2+
D[2](chi)(t,x)^2))*N(t)*diff(diff(a(t),t),t)+(-N(t)*a(t)^2*diff(a(t),t)^2+diff(
a(t),t)*a(t)^3*diff(N(t),t))*diff(dphi(t,x),t)^2-6*a(t)*diff(phi(t),t)*(-1/3*a(
t)^2*diff(a(t),t)*diff(alpha(t,x),t)*N(t)+1/3*(4*diff(a(t),t)*a(t)^2*N(t)-diff(
N(t),t)*a(t)^3)*diff(zet(t,x),t)-diff(a(t),t)*a(t)^2*(zet(t,x)-alpha(t,x))*diff
(N(t),t)+(a(t)*(zet(t,x)-alpha(t,x))*diff(a(t),t)^2-2/9*diff(a(t),t)*D[2,2](chi
)(t,x)*N(t)-1/9*a(t)*D[1,2,2](chi)(t,x)*N(t))*N(t))*diff(dphi(t,x),t)+diff(a(t)
,t)*N(t)^2*(-diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*diff(dphi(t,x),x)^2+2*N(t)*
diff(phi(t),t)*diff(a(t),t)*D[2](chi)(t,x)*(-diff(N(t),t)*a(t)+diff(a(t),t)*N(t
))*diff(dphi(t,x),x)+diff(phi(t),t)^2*(-2*N(t)*diff(alpha(t,x),t)*a(t)^3*diff(a
(t),t)*alpha(t,x)+2*alpha(t,x)*(4*diff(a(t),t)*a(t)^3*N(t)-a(t)^4*diff(N(t),t))
*diff(zet(t,x),t)-diff(a(t),t)*a(t)*(6*alpha(t,x)*a(t)^2*zet(t,x)-6*a(t)^2*
alpha(t,x)^2+D[2](chi)(t,x)^2)*diff(N(t),t)+((6*alpha(t,x)*a(t)^2*zet(t,x)-6*a(
t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*diff(a(t),t)^2-4/3*a(t)*N(t)*diff(a(t),t)*D
[2,2](chi)(t,x)*alpha(t,x)-2/3*N(t)*a(t)^2*D[1,2,2](chi)(t,x)*alpha(t,x))*N(t))
)*N(t)^9*D(F)(-diff(phi(t),t)^2/N(t)^2)+6*(-2/3*a(t)^2*N(t)^3*(zet(t,x)-alpha(t
,x))*diff(diff(alpha(t,x),x),x)+2*N(t)*a(t)^4*(zet(t,x)-alpha(t,x))*diff(diff(
zet(t,x),t),t)+4/3*a(t)^2*N(t)^3*(zet(t,x)-alpha(t,x))*diff(diff(zet(t,x),x),x)
-8/3*N(t)^2*a(t)^2*D[2](chi)(t,x)*diff(diff(zet(t,x),t),x)-a(t)*N(t)*(-3*a(t)^2
*zet(t,x)^2+6*alpha(t,x)*a(t)^2*zet(t,x)-3*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2
)*diff(diff(a(t),t),t)-6*(1/3*a(t)^2*diff(zet(t,x),t)+(zet(t,x)-alpha(t,x))*a(t
)*diff(a(t),t)-1/9*D[2,2](chi)(t,x)*N(t))*a(t)^2*N(t)*diff(alpha(t,x),t)+8*(-1/
4*(zet(t,x)-alpha(t,x))*a(t)^2*diff(N(t),t)+N(t)*((zet(t,x)-alpha(t,x))*a(t)*
diff(a(t),t)-1/6*D[2,2](chi)(t,x)*N(t)))*a(t)^2*diff(zet(t,x),t)+2/3*N(t)^3*a(t
)^2*diff(alpha(t,x),x)^2+2*(-1/3*N(t)^3*a(t)^2*diff(zet(t,x),x)+diff(a(t),t)*D[
2](chi)(t,x)*a(t)*N(t)^2)*diff(alpha(t,x),x)+2*N(t)^3*a(t)^2*diff(zet(t,x),x)^2
-4/3*(diff(a(t),t)*D[2](chi)(t,x)+1/2*a(t)*D[1,2](chi)(t,x))*a(t)*N(t)^2*diff(
zet(t,x),x)+diff(a(t),t)*a(t)*(-3*a(t)^2*zet(t,x)^2+6*alpha(t,x)*a(t)^2*zet(t,x
)-3*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*diff(N(t),t)+((3*a(t)^2*zet(t,x)^2-6*
alpha(t,x)*a(t)^2*zet(t,x)+3*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*diff(a(t),t)
^2-2*a(t)*(2/3*N(t)*D[2,2](chi)(t,x)*zet(t,x)-2/3*N(t)*D[2,2](chi)(t,x)*alpha(t
,x)+D[2](chi)(t,x)*D[1,2](chi)(t,x))*diff(a(t),t)-2/3*N(t)*a(t)^2*D[1,2,2](chi)
(t,x)*(zet(t,x)-alpha(t,x)))*N(t))*N(t)^11*F(-diff(phi(t),t)^2/N(t)^2)+12*(1/12
*(-6*(zet(t,x)-1/3*alpha(t,x))*a(t)^3*N(t)*diff(diff(dphi(t,x),t),t)+2*a(t)*N(t
)^3*(alpha(t,x)+zet(t,x))*diff(diff(dphi(t,x),x),x)+4*a(t)*N(t)^2*D[2](chi)(t,x
)*diff(diff(dphi(t,x),t),x)+a(t)*N(t)*(-3*a(t)^2*zet(t,x)^2+6*alpha(t,x)*a(t)^2
*zet(t,x)-3*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*diff(diff(phi(t),t),t)-18*(-1
/9*diff(alpha(t,x),t)*N(t)*a(t)^2+1/3*diff(zet(t,x),t)*N(t)*a(t)^2-1/3*(zet(t,x
)-1/3*alpha(t,x))*diff(N(t),t)*a(t)^2+((zet(t,x)-1/3*alpha(t,x))*diff(a(t),t)*a
(t)-1/9*D[2,2](chi)(t,x)*N(t))*N(t))*a(t)*diff(dphi(t,x),t)+2*N(t)^2*(diff(zet(
t,x),x)*a(t)*N(t)+diff(alpha(t,x),x)*a(t)*N(t)+diff(a(t),t)*D[2](chi)(t,x)+a(t)
*D[1,2](chi)(t,x))*diff(dphi(t,x),x)+diff(phi(t),t)*(6*N(t)*a(t)^3*(zet(t,x)-
alpha(t,x))*diff(alpha(t,x),t)-6*N(t)*a(t)^3*(zet(t,x)-alpha(t,x))*diff(zet(t,x
),t)-2*N(t)^2*a(t)*diff(alpha(t,x),x)*D[2](chi)(t,x)+2*N(t)^2*a(t)*diff(zet(t,x
),x)*D[2](chi)(t,x)+(3*a(t)^3*zet(t,x)^2-6*a(t)^3*zet(t,x)*alpha(t,x)+3*a(t)^3*
alpha(t,x)^2-a(t)*D[2](chi)(t,x)^2)*diff(N(t),t)+((-9*a(t)^2*zet(t,x)^2+18*
alpha(t,x)*a(t)^2*zet(t,x)-9*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*diff(a(t),t)
+2*a(t)*(N(t)*D[2,2](chi)(t,x)*zet(t,x)-N(t)*D[2,2](chi)(t,x)*alpha(t,x)+D[2](
chi)(t,x)*D[1,2](chi)(t,x)))*N(t)))*N(t)^11*Q(-diff(phi(t),t)^2/N(t)^2)-1/2*(2/
3*diff(phi(t),t)*a(t)^3*N(t)*(alpha(t,x)*diff(phi(t),t)-diff(dphi(t,x),t))*diff
(diff(dphi(t,x),t),t)-2/3*diff(phi(t),t)*a(t)*N(t)^3*(alpha(t,x)*diff(phi(t),t)
-diff(dphi(t,x),t))*diff(diff(dphi(t,x),x),x)+1/3*a(t)*(-diff(dphi(t,x),t)^2*a(
t)^2-6*a(t)^2*diff(phi(t),t)*(zet(t,x)-alpha(t,x))*diff(dphi(t,x),t)+diff(dphi(
t,x),x)^2*N(t)^2+2*diff(phi(t),t)*N(t)*diff(dphi(t,x),x)*D[2](chi)(t,x)+diff(
phi(t),t)^2*(6*alpha(t,x)*a(t)^2*zet(t,x)-6*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^
2))*N(t)*diff(diff(phi(t),t),t)+((-3*diff(a(t),t)*a(t)^2*N(t)+diff(N(t),t)*a(t)
^3)*diff(dphi(t,x),t)^2-6*a(t)*diff(phi(t),t)*(-1/9*diff(alpha(t,x),t)*N(t)*a(t
)^2+1/3*diff(zet(t,x),t)*N(t)*a(t)^2-1/3*(zet(t,x)-4/3*alpha(t,x))*a(t)^2*diff(
N(t),t)+(a(t)*(zet(t,x)-4/3*alpha(t,x))*diff(a(t),t)-1/9*D[2,2](chi)(t,x)*N(t))
*N(t))*diff(dphi(t,x),t)+N(t)^2*(-1/3*diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*diff
(dphi(t,x),x)^2+2*(-1/3*diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*D[2](chi)(t,x)*
diff(phi(t),t)*N(t)*diff(dphi(t,x),x)+(-2/3*N(t)*diff(alpha(t,x),t)*a(t)^3*
alpha(t,x)+2*a(t)^3*N(t)*diff(zet(t,x),t)*alpha(t,x)+(2*a(t)^3*alpha(t,x)^2-1/3
*a(t)*D[2](chi)(t,x)^2-2*a(t)^3*zet(t,x)*alpha(t,x))*diff(N(t),t)+((6*alpha(t,x
)*a(t)^2*zet(t,x)-6*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)*diff(a(t),t)-2/3*
alpha(t,x)*D[2,2](chi)(t,x)*a(t)*N(t))*N(t))*diff(phi(t),t)^2)*diff(phi(t),t))*
N(t)^9*D(Q)(-diff(phi(t),t)^2/N(t)^2)+a(t)*(-1/6*(-4*a(t)^2*diff(phi(t),t)*N(t)
*(alpha(t,x)*diff(phi(t),t)-diff(dphi(t,x),t))*diff(diff(dphi(t,x),t),t)-(-5*
diff(dphi(t,x),t)^2*a(t)^2-6*a(t)^2*diff(phi(t),t)*(zet(t,x)-3*alpha(t,x))*diff
(dphi(t,x),t)+diff(dphi(t,x),x)^2*N(t)^2+2*diff(phi(t),t)*N(t)*diff(dphi(t,x),x
)*D[2](chi)(t,x)+diff(phi(t),t)^2*(6*alpha(t,x)*a(t)^2*zet(t,x)-14*a(t)^2*alpha
(t,x)^2+D[2](chi)(t,x)^2))*N(t)*diff(diff(phi(t),t),t)+(-9*diff(dphi(t,x),t)^2*
a(t)^2*diff(N(t),t)-4*(diff(alpha(t,x),t)*N(t)+3/2*(zet(t,x)-11/3*alpha(t,x))*
diff(N(t),t))*a(t)^2*diff(phi(t),t)*diff(dphi(t,x),t)+N(t)^2*diff(N(t),t)*diff(
dphi(t,x),x)^2+2*diff(phi(t),t)*N(t)*diff(N(t),t)*diff(dphi(t,x),x)*D[2](chi)(t
,x)+diff(phi(t),t)^2*(4*a(t)^2*N(t)*diff(alpha(t,x),t)*alpha(t,x)+diff(N(t),t)*
(6*alpha(t,x)*a(t)^2*zet(t,x)-14*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2)))*diff(
phi(t),t))*(-diff(diff(phi(t),t),t)*N(t)+diff(N(t),t)*diff(phi(t),t))*diff(phi(
t),t)^2*N(t)^4*D(A4)(-diff(phi(t),t)^2/N(t)^2)+1/6*(-diff(diff(phi(t),t),t)*N(t
)+diff(N(t),t)*diff(phi(t),t))*diff(phi(t),t)^4*N(t)^2*(-4*a(t)^2*diff(phi(t),t
)*N(t)*(alpha(t,x)*diff(phi(t),t)-diff(dphi(t,x),t))*diff(diff(dphi(t,x),t),t)-
(-9*diff(dphi(t,x),t)^2*a(t)^2-6*(zet(t,x)-13/3*alpha(t,x))*a(t)^2*diff(phi(t),
t)*diff(dphi(t,x),t)+diff(dphi(t,x),x)^2*N(t)^2+2*diff(phi(t),t)*N(t)*diff(dphi
(t,x),x)*D[2](chi)(t,x)+diff(phi(t),t)^2*(6*alpha(t,x)*a(t)^2*zet(t,x)-18*a(t)^
2*alpha(t,x)^2+D[2](chi)(t,x)^2))*N(t)*diff(diff(phi(t),t),t)+diff(phi(t),t)*(-\
13*diff(dphi(t,x),t)^2*a(t)^2*diff(N(t),t)-4*a(t)^2*diff(phi(t),t)*(diff(alpha(
t,x),t)*N(t)+3/2*diff(N(t),t)*(zet(t,x)-5*alpha(t,x)))*diff(dphi(t,x),t)+N(t)^2
*diff(N(t),t)*diff(dphi(t,x),x)^2+2*diff(phi(t),t)*N(t)*diff(N(t),t)*diff(dphi(
t,x),x)*D[2](chi)(t,x)+(4*a(t)^2*N(t)*diff(alpha(t,x),t)*alpha(t,x)+diff(N(t),t
)*(6*alpha(t,x)*a(t)^2*zet(t,x)-18*a(t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2))*diff(
phi(t),t)^2))*D(A5)(-diff(phi(t),t)^2/N(t)^2)+3*(alpha(t,x)*diff(phi(t),t)-diff
(dphi(t,x),t))^2*(1/3*diff(diff(phi(t),t),t)*N(t)*a(t)+(-1/3*diff(N(t),t)*a(t)+
diff(a(t),t)*N(t))*diff(phi(t),t))^2*diff(phi(t),t)^2*N(t)^4*(D@@2)(A2)(-diff(
phi(t),t)^2/N(t)^2)+(alpha(t,x)*diff(phi(t),t)-diff(dphi(t,x),t))^2*(-diff(diff
(phi(t),t),t)*N(t)+diff(N(t),t)*diff(phi(t),t))*a(t)*(1/3*diff(diff(phi(t),t),t
)*N(t)*a(t)+(-1/3*diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*diff(phi(t),t))*diff(phi
(t),t)^4*N(t)^2*(D@@2)(A3)(-diff(phi(t),t)^2/N(t)^2)+(-2/3*diff(diff(phi(t),t),
t)*diff(N(t),t)*diff(phi(t),t)*N(t)*a(t)^2+1/3*diff(diff(phi(t),t),t)^2*N(t)^2*
a(t)^2+(1/3*diff(N(t),t)^2*a(t)^2+diff(a(t),t)^2*N(t)^2)*diff(phi(t),t)^2)*(
alpha(t,x)*diff(phi(t),t)-diff(dphi(t,x),t))^2*diff(phi(t),t)^2*N(t)^4*(D@@2)(
A1)(-diff(phi(t),t)^2/N(t)^2)-1/3*diff(phi(t),t)^4*N(t)^2*a(t)^2*(-diff(diff(
phi(t),t),t)*N(t)+diff(N(t),t)*diff(phi(t),t))^2*(alpha(t,x)*diff(phi(t),t)-
diff(dphi(t,x),t))^2*(D@@2)(A4)(-diff(phi(t),t)^2/N(t)^2)+1/3*diff(phi(t),t)^6*
a(t)^2*(-diff(diff(phi(t),t),t)*N(t)+diff(N(t),t)*diff(phi(t),t))^2*(alpha(t,x)
*diff(phi(t),t)-diff(dphi(t,x),t))^2*(D@@2)(A5)(-diff(phi(t),t)^2/N(t)^2)+2*((
alpha(t,x)*diff(phi(t),t)-diff(dphi(t,x),t))^2*diff(phi(t),t)^2*(diff(diff(a(t)
,t),t)*N(t)*a(t)+(-diff(N(t),t)*a(t)+diff(a(t),t)*N(t))*diff(a(t),t))*(D@@2)(F)
(-diff(phi(t),t)^2/N(t)^2)-1/2*(alpha(t,x)*diff(phi(t),t)-diff(dphi(t,x),t))^2*
a(t)*(1/3*diff(diff(phi(t),t),t)*N(t)*a(t)+(-1/3*diff(N(t),t)*a(t)+diff(a(t),t)
*N(t))*diff(phi(t),t))*diff(phi(t),t)^2*(D@@2)(Q)(-diff(phi(t),t)^2/N(t)^2)+1/6
*(1/2*(-diff(dphi(t,x),t)^2*a(t)^2-6*(zet(t,x)-1/3*alpha(t,x))*a(t)^2*diff(phi(
t),t)*diff(dphi(t,x),t)+diff(dphi(t,x),x)^2*N(t)^2+2*diff(phi(t),t)*N(t)*diff(
dphi(t,x),x)*D[2](chi)(t,x)+diff(phi(t),t)^2*(6*alpha(t,x)*a(t)^2*zet(t,x)-2*a(
t)^2*alpha(t,x)^2+D[2](chi)(t,x)^2))*N(t)^2*D(P)(-diff(phi(t),t)^2/N(t)^2)+1/4*
N(t)^4*(3*a(t)^2*zet(t,x)^2+6*alpha(t,x)*a(t)^2*zet(t,x)-a(t)^2*alpha(t,x)^2+D[
2](chi)(t,x)^2)*P(-diff(phi(t),t)^2/N(t)^2)+diff(phi(t),t)^2*a(t)^2*(D@@2)(P)(-
diff(phi(t),t)^2/N(t)^2)*(alpha(t,x)*diff(phi(t),t)-diff(dphi(t,x),t))^2)*N(t)^
3)*N(t)^7))*a(t))/a(t)/N(t)^13;
