Предмет: Алгебра, автор: leravasilati

Упростите выражение ( 10 класс)

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Автор ответа: fenix6810

cos(a-b)=cosacosb-sinasinb
=cos(70+3x-10-3x)=cos60=1/2

yanameste: Помогите пожалуйста https://znanija.com/task/48277985

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