`int_0^pi (cos^2x)dx`,

If I=int_0^(3pi) f(cos^2x)dx and J=int_0^pi f(cos^2x)dx , then (A) I=5J (B) I=J (C) I=3J (D) none of these

Evaluate: int_0^pi x/(1+cos^2x)dx

Evaluate int_0^(pi/2) cos^2x dx

What is int_0^(pi//2) (cos x)dx equal to

Evaluate: int_0^pi x/(a^2-cos^2x)dx

Evaluate : int_(0)^(pi) cos^(2)x.dx

Evaluate: int_0^(pi//2)cos^2x\ dx

(i) int_0^(pi//2) cos x dx (ii) int_(-pi//2)^(pi//2) cos x dx (iii) int_0^(pi//2) cos 2x dx

Evaluate each of the following integral: int_0^(pi//2)cos^2x\ dx