Question

Вычислите sin(arc sin(-1))= cos (2arc cos 1/2)=

Answer 1

$\sin(\arcsin(-1))=\sin(-\frac{\pi}{2})=-1$

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