$-1\le x\le1$  

 $-1\le y\le1$  

 $\frac{-\pi}{2}\le x\le\frac{\pi}{2}$  

 $\frac{-\pi}{2}\le y\le\frac{\pi}{2}$  

 $-1\le x\le1$  

 $-1\le y\le1$  

 $\frac{-\pi}{2}\le x\le\frac{\pi}{2}$  

جميع الاعداد الحقيقية 

 $-1\le x\le1$  

 $-1\le y\le1$  

 $\frac{-\pi}{2}\le x\le\frac{\pi}{2}$  

 $-90\degree\le y\le90\degree$  

$90\degree$

$180\degree$

$360\degree$

$0\degree$