$a)\sin x=\frac{1}{2}\text{dla}x=\frac{\pi }{6}\text{lub}x=\frac{5\pi }{6}$  

$b)\sin x=\frac{\sqrt{2}}{2}\text{dla}x=\frac{\pi }{4}\text{lub}x=\frac{3\pi }{4}$  

$c)\sin x=-\frac{1}{2}\text{dla}x=\frac{7\pi }{6}\text{lub}\frac{11\pi }{6}$  

$d)\sin x=-\frac{\sqrt{3}}{2}\text{dla}x=\frac{4\pi }{3}\text{lub}x=\frac{5\pi }{3}$