Предмет: Математика, автор: gggvvvh

решите пожалуйстастстсь

Приложения:

vasilaxon96: отметь как лучшее пожалуйста я все уже решила

Ответы

Автор ответа: vasilaxon96

0

Ответ:

в)cos²15°-sin²15°=cos2*15°=cos30°=√3/2

г) (cos15°+sin15°)²=cos²15°+2cos15°sin15°+sin²15°=1+2cos15°sin15°=1+sin30°=1+1/2=1.5

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