symbolic integration needed in the present code

syms h q x f(x) f0 f1(x) f2(x) f3(x)

f = f0 + f1*q + f2*q.^2 + f3*q.^3; Eq0 = diff(f,x) - diff(f0,x); Eq1 = diff(f,x) - f^2;

A = (1-q)*(Eq0) == h*q*Eq1; B = diff(A,q); C = subs(B,[q,f0],[0,1]);

D = int(C,x)

%%% D: f1 = h*x + Constant of integration; This answer should come when I run this code but ...

Answer 1

[Paul]

syms h q x f(x) f0 f1(x) f2(x) f3(x)
f = f0 + f1*q + f2*q.^2 + f3*q.^3;
Eq0 = diff(f,x) - diff(f0,x);
Eq1 = diff(f,x) - f^2; 
A = (1-q)*(Eq0) == h*q*Eq1;
B = diff(A,q);
C = subs(B,[q,f0],[0,1])

C(x) = 

As stated on its doc page, int() does not return a constant of integration in its result, so it has to be added explicitly:

syms C1
D = int(lhs(C),x) == int(rhs(C),x) + C1

D(x) = 

[MINATI PATRA]

why am I not able to accept this answer?

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How to resolve?

Thanks Paul