Предмет: Алгебра, автор: sidaaaaaa03

sin 20 градусов cos 40 градусов + cos20 градусов sin 40 градусов

Ответы

Автор ответа: Luluput

$sin 20кcos40к+cos20кsin40к=sin(20к+40к)=sin60к= frac{ sqrt{3} }{2}$

$sin(x+y)=sinx*cosy+siny*cosx$

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