Предмет: Алгебра, автор: denimusienk

Решите уравнение методом разложения на множители

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Автор ответа: Mary88888

cos7x+cosx=0
2cos4xcos3x=0
1) cos4x=0;4x=π/2+πn;x=π/8+πn/4,n∈Z
2) cos3x=0;3x=π/2+πk;x=π/6+πk/3,k∈Z.

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