sin π 6 = 1 2 {\displaystyle \sin {\frac {\pi }{6}}={\frac {1}{2}}}
sin π 4 = 2 2 {\displaystyle \sin {\frac {\pi }{4}}={\frac {\sqrt {2}}{2}}}
sin π 3 = 3 2 {\displaystyle \sin {\frac {\pi }{3}}={\frac {\sqrt {3}}{2}}}