здесь несколько заданий: 1) tg 5p/4 2) cos (5/4)p 3)cos (5/3)p 4)sin(-13/3)p пожалуйста...

1) $tg(\frac{5\pi}{4})=tg(\pi+\frac{\pi}{4})=tg(\frac{\pi}{4})=1$

2) $cos(\frac{5\pi}{4})=cos(\pi+\frac{\pi}{4})=-cos(\frac{\pi}{4})=-\frac{\sqrt{2}}{2}$

3) $cos(\frac{5\pi}{3})=cos(2\pi-\frac{\pi}{3})=-cos(\frac{\pi}{3})=-\frac{1}{2}$

4) $sin(\frac{-13\pi}{3})=- sin(\frac{13\pi}{3}) =-sin(4\pi+\frac{\pi}{3})=-sin(\frac{\pi}{3})=-\frac{\sqrt{3}}{2}$