Помогите пожалуйста первый вариант 2 задание!
A) (x+π/3) ≤ π/3 + 2πk; k∈Z; x ∈[ 2π/3 +2πk; π/3 +2πk, k∈Z]; б) (3x - 2π/3) = 2π/3 +2πn;n∈Z; 3x = 4π/3 +2πn,n∈Z; x = 4π/9 +2πn/3,n∉Z; 3x = 5π/3+2πn, n∈Z; x = 5π /9 +2πn/3,n∈Z; x∈ [5π/9 +2πn/3; 4π/9 +2πn/3;n∈Z]