## Thomas' Calculus 13th Edition

-$\frac{\pi}{4}\leq \Theta \leq \frac{3\pi}{4}$ ,$0\leq r \leq cos\Theta$
Describing the given region in polar coordinates of the below graph y=x=>$\Theta=\frac{\pi}{4},y=-x=>\Theta$ $=\frac{3\pi}{4}.y=1=>cos \Theta$ -$\frac{\pi}{4}\leq \Theta \leq \frac{3\pi}{4}$ ,$0\leq r \leq cos\Theta$