Помогите пожалуйста [tex]\frac{sin4\alpha }{4sin\alpha }[/tex]. Created by tatianakhyliuk. algebra-ru

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tatianakhyliuk @tatianakhyliuk

July 2022 1 5 Report

Помогите пожалуйста
[tex]\frac{sin4\alpha }{4sin\alpha }[/tex]

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Miroslava227

Ответ:

$\frac{ \sin(4 \alpha ) }{ 4\sin( \alpha ) } = \frac{2 \sin( 2\alpha ) \cos( 2\alpha ) }{ 4\sin( \alpha ) } = \\ = \frac{4 \sin( \alpha ) \cos( \alpha ) \cos(2 \alpha ) }{4 \sin( \alpha ) } = \cos( \alpha ) \cos( 2\alpha )$

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obyasnite pozhalujsta kak iz pervogo primera poluchilsya vtoroj

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