Помогите, срочно!4*sin10*sin 50*sin70=. Created by Любаааа. algebra-ru

Помогите, срочно!4*sin10*sin 50*sin70=...

Любаааа @Любаааа

July 2022 1 8 Report

Помогите, срочно!
4*sin10*sin 50*sin70=

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mmb1

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4*sin10*sin 50*sin70=4sin(90-80)sin(90-40)sin(90-20)=4cos80cos40cos20=4cos80cos40cos20sin20/sin20=2cos80cos40sin40/sin20=sin160/2sin20=sin(180-20)/2sin20=sin20/2sin20=1/2

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