I_(2)-int_(0)^((pi)/(3))x cos xdx

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

int_(0)^((pi)/(4))x cos xdx

int_(0)^((pi)/(4))x cos xdx

int_(0)^((pi)/(2))cos xdx=?

int_(0)^((pi)/(2))cos xdx=

int_(0)^((pi)/(2))cos xdx=

int_(0)^((pi)/(2))cos x cos3xdx

If I_(I)=int_(0)^( pi/2)cos(sin x)dx,I_(2)=int_(0)^((pi)/(2))sin(cos x)d, and I_(3)=int_(0)^((pi)/(2))cos xdx then find the order in which the values I_(1),I_(2),I_(3), exist.

int_(0)^((pi)/(6))cos3xdx

int_(0)^((pi)/(2))cos^(2)xdx