This is the question and the integral i setup. But its wrong. Not sure where i went wrong.

Attachment 29448

This is the equation that I setup

$\displaystyle \int_0^\frac{\pi}{2} \int_0^\pi $ $\displaystyle sin(x)sin(y)dxdy$

I also tried setting x range $\displaystyle -\pi $ to $\displaystyle \pi$ but i kept getting zero.