Предмет: Алгебра, автор: tzzzztzzzztt

ПОМОГИТЕ!!!!!! ПОЖАЛУЙСТА ПОМОГИТЕ!!!!!!
СРОЧНО!!!!!!!!!!
cos(п/2 - a) + cos(3п/2 -a) + sin(п-а)

Ответы

Автор ответа: Universalka
1

Cos(\frac{\pi }{2}-\alpha)+Cos(\frac{3\pi }{2}-\alpha)+Sin(\pi-\alpha)=Sin\alpha-Sin\alpha+Sin\alpha=Sin\alpha

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