Предмет: Алгебра, автор: ddxriposksqlhxuzdl

Решите уравнение
cos2x=cos3x

Ответы

Автор ответа: skrickaa49

1

Ответ:x=2kп/5; k€Z

x=2kп; k€Z

Объяснение:cos2x= cos3x

cos2x- cos3x=0

-2sin(5x/2) (sin-x/2)=0

-2sin(5x/2)*(-sin(x/2))=0

sin(5x/2) sin(x/2)=0

sin(5x/2) (sin-x/2)=0

sin(5x/2)=0

(sin-x/2)=0

x=2kп/5; k€Z

x=2kп; k€Z

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