Решите тригонометрическое неравенство cos(x/3+pi/3) меньше =cos5pi/3

cos(x/3 + π/3) ≤ cos(5π/3) cos(x/3 + π/3) ≤ 1/2 arccos(1/2) + 2πn ≤ (x/3 + π/3) ≤ 2π - arccos(1/2) + 2πn, n∈Z π/3+ 2πn ≤ (x/3 + π/3) ≤ 2π - π/3 + 2πn, n∈Z π/3+ 2πn ≤ (x/3 + π/3) ≤ 5π/3 + 2πn, n∈Z π/3 - π/3  + 2πn ≤ (x/3)  ≤ 5π/3 - π/3 + 2πn, n∈Z 2πn ≤ (x/3)  ≤ 4π/3  + 2πn, n∈Z 6πn ≤  x  ≤ 4π  + 6πn, n∈Z