Cosx/3=-1/2

Question

Cosx/3=-1/2

Answer 1

Х/3 = ⁺₋arccos(-1/2) + 2πn, n∈Z
x/3 = ⁺₋ 2π/3 +2πn, n∈Z
Умножим обе части на 3
x= ⁺₋ 2π +6πn, n∈Z