[int_(0)^( pi/4)int_(0)^((pi)/(sin x)dx)(B)int_(0)^( pi/2)(x)/(sin x)dxquad " (C) "(1)/(2)int_(0)^( pi/2)(x)/(sin x)dxquad " (D) "(1)/(2)int_(0)^( pi/4)(x)/(sin x)dx]

int_(0)^( pi)(dx)/(1+sin x)

int_(0)^( pi/2)(sin x)*dx

" 2."int_(0)^( pi)(x)/(1+sin x)dx

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

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

int_(0)^( pi/4)sin|x|dx

int_(0)^( pi)(x)/(1+sin^(2)x)*dx

int_(0)^( pi)(x)/(1+sin^(2)x)*dx

int_(0)^(pi) dx/(1-sin x)=

int_(0)^(1)(tan^(-1)x)/(x)dx is equals to int_(0)^((pi)/(2))(sin x)/(x)dx(b)int_(0)^((pi)/(2))(x)/(sin x)dx(1)/(2)int_(0)^((pi)/(2))(sin x)/(x)dx(d)(1)/(2)int_(0)^((pi)/(2))(x)/(sin x)dx