Question

Помогите решить… Cos5x=-1/2

Answer 1

5x=+- arccos(-1/2)+2 Пn
5x=+-П-arccos1/2+2Пn
5x=+-П-П/3+2Пn
5x=+-2П/3+2Пn |:5
X= +-2П/15 +2Пn/5