$$sen\ x=\ \frac{\sqrt{2}}{2}$$

$$x=\ sen^{-1}\left(\frac{\sqrt{2}}{2}\right)$$

$$sen\ x\ =\ \sqrt{2}-2$$

$$sen\ x=\ 2\times\sqrt{2}$$

$45°=\frac{\pi}{4}$

$225°=\frac{5\pi}{4}$

$135°=\frac{3\pi}{4}$

$315°=\frac{7\pi}{4}$

30°, 60°

30°, 330°

45°, 135°

135°, 330°

$$\frac{\pi}{8},\ \frac{11\pi}{6}$$

$$\frac{\pi}{6},\ \frac{11\pi}{6}$$

$$\frac{\pi}{4},\ \frac{7\pi}{4}$$

$$\frac{\pi}{6},\ \frac{2\pi}{3}$$

$$\frac{2\pi}{5}$$  

$$\frac{3\pi}{4}$$  

$$\frac{7\pi}{4}$$  

$$\frac{5\pi}{4}$$