Question

2cos(2x-п/3)≥1 помогите срочно

Answer 1

1/2≤cos(2x-π/3)≤1

-π/3+2πk≤2x-π/3≤π/3+2πk
2πk≤2x≤2π/3+2πk
πk≤x≤π/3+πk