Предмет: Математика, автор: tamila3030

cos15градусов пожалуйста решите

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Автор ответа: kirichekov

0

cos15°=cos(45°-30°)=cos45°*cos30°-sin45°*sin30°=
=(√2/2)*(√3/2)-(√2/2)*(1/2)=(√2/2)*[(√3/2)-(1/2)]=√2*(√3-1)/4

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