Ответы на вопрос:
Пошаговое объяснение:
18) x/3 = 2pi/3 + 2pin x/3 = 4pi/3 + 2pin
x = 2pi + 6pin, n∈Z x = 4pi + 8pin, n∈Z
19) ОДЗ : (-беск; -3) U (4; + беск)
x^2 - x -12 >0
x1 = 4
x2 = -3
x^2 - x -12 < 8
x^2 - x - 20 < 0
x1 = 5 x2 = -4
x∈ (-4; 5), с учетом ОДЗ
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ответ: x∈ (-4;-3) U (4;5)
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