Question

Даю много балловввввввввввввввввввввввввввввввввв

Answer 1

$\displaystyle cosx=-\frac{1}{2}\\\\x= \pm \frac{2\pi }{3}+2\pi n; n\in Z\\\\x= \pm 120+360n; n\in Z$

Answer 2

Ответ:

x=±120°+360°n; n∈Z

Объяснение:

cosx=-1/2

x=±arccos(-1/2)+360°n; n∈Z

x=±(180°-60°)+360°n; n∈Z;

x=±120°+360°n; n∈Z