cos6x=1/2 помогите плиз

cos 6x = 1/21) 6x = +π/3 + 2πk → x1 = π/18 + πk/3  2) 6x = -π/3 + 2πk → x2 = -π/18 + πk/3  Ответ: х = +-π/18 + πk/3  (k ∈Z)