Предмет: Математика, автор: anyateplova20

помогите решить -9cosx+4=4

Ответы

Автор ответа: DayLong

$-9cosx+4=4$
$-9cosx=0$
$cosx=0$
$x= \frac{ \pi }{2}+ \pi n, n$ принадлежит Z

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