evaluate `int_(0)^(pi/2)|cos x|dx`

int_(0)^(2 pi)|cos x|dx

int_(0)^( pi)|cos x|dx=2

Evaluate int_(0)^(4pi)|cos x| dx .

Evaluate : int_(0)^(pi) |cos x| dx

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

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

int_(0)^(pi//2) x^(2) cos x dx

Evaluate: int_(0)^( pi/2)(cos x)/(1+cos x+sin x)dx

Evaluate: int_(-2)^(2)|x cos pi x|dx

Prove that : int_(0)^(a) f(x) dx = int_(0)^(a) f(a-x)dx hence evaluate : int_(0)^(pi//2) (sin x)/(sin x + cos x) dx