" 11."int_(0)^((pi)/(2))x^(2)sin x^(3)dx

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

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

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

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

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

int_(0)^(pi//2) x^(2) sin x " " dx=

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

int_(0)^((pi)/(2))(sin^(3)x)/(sin^(3)x+cos^(3)x)dx