Cos(3x-pi/3)=0 пожалуйста
3x - π/3 = π/2 + πk, k ∈Z 3x = π/2 +πk + π/3, k ∈Z 3x = 5π/6 + πk , k∈Z x = 5π/18 + πkl/3, k ∈Z