Cos(1/2x-4pi/3)=0 ..... ...
Решение Cos(1/2x-4pi/3)=0 1/2x-4pi/3 = π/2 + πn, n ∈ Z 1/2x = π/2 + 4π/3 + πn, n ∈ Z 1/2x = 11π/6 + πn, n ∈ Z x = 22π/6 + 2πn, n ∈ Z