Решите уравнение \(\cos t =-\frac{1}{2}.\)
\(\pm \frac{2\pi}{3}+2\pi n, n\in Z\)
\(\frac{2\pi}{3}+2\pi n, n\in Z\)
\(-\frac{\pi}{3}+2\pi n, -\frac{2\pi}{3}+2\pi n, n\in Z\)
\(\pm \frac{5\pi}{6}+2\pi n, n\in Z\)