Ответы на вопрос:
2cos(x/3) + 1 = 0 cos(x/3) = - 1/2 x/3 = (+ -)arccos(-1/2) + 2πn, n∈z x/3 = (+ π - arccos(1/2)) + 2πn, n∈z x/3 = (+ π - π/3) + 2πn, n∈z x/3 = (+ π/3) + 2πn, n∈z x = (+ π) + 6πn, n∈z
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