2cosx-√3_<0 помогите

2Cosx <= √3
Cosx <= √3/2
arccos(√3/2) + 2πn <= x <= 2π- arccos(√3/2) + 2πn n ∈ Z
π/6 + 2πn <= x <= 11π/6 + 2πn, n ∈ Z
Ответ: π/6 + 2πn <= x <= 11π/6 + 2πn, n ∈ Z.