Предмет: Алгебра, автор: NikitaMaltcev1

Решите уравнение: cos^2x+cosx=-sin^2x

Ответы

Автор ответа: kirichekov

0

cos²x+cosx=-sin²x
(cos²x+sin²x)+cosx=0
1+cosx=0
cosx=-1
x=π+2πn, n∈Z

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