Предмет: Математика, автор: Аноним

(sin2x-cos(90-x))/sinx= помогите

Ответы

Автор ответа: MrCalling

$frac{sin2x-cos(90-x)}{sinx}$ = $frac{2sinxcosx-sinx}{sinx}$ = $frac{sinx(2cosx-1)}{sinx}$ =2cosx-1

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