Chapter 5.4, Problem 193E

In the following exercises, evaluate the triple integrals over the bounded legion $E=\left\{\left(x,y,z\right)|a\le x\le b,h_1\left(x\right)\le y\le h_2\left(x\right),e\le z\le f\right\}$

193. ${\displaystyle \underset{E}{\iiint }\left(\sin x+\sin y\right)dV,}$ where $E=\left\{\left(x,y,z\right)|0\le 1x\le \frac{\pi }{2},-\cos x\le y\cos x,-1\le z\le 1\right\}$