sin22cos8+cos158cos98. Created by jakuasilbek. matematika-ru

sin22cos8+cos158cos98...

jakuasilbek @jakuasilbek

September 2021 1 28 Report

sin22cos8+cos158cos98

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nafanya2014

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sin22°·cos8°+cos158°·cos98°=sin22°·cos8°+cos(180°-158°)·cos(90°+8°)=
=sin22°·cos8°+(-cos22°)·(-sin8°)=sin22°·cos8°+cos22°·sin8°=
=sin (22°+8°)=sin30°=1/2=0,5

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