Question

Решить: модуль сos x = 1/2

Answer 1

|cos x|=1/2

cos x=1/2 ∨ cos x=-1/2

x=-π/3-2kπ ∨ x=-π/3+2kπ ∨ x=-2π/3-2kπ ∨ x=-2π/3+2kπ