Срочно.


Обчисліть:

а)cos 45градусов sin45 градусов-sin30 градусов
б)sin60градусов cos 30градусов-sin9-градусов
в)tg 45градусов sin 45градусов
г)2 сtg 30градусов sin 60градусов-cos 60градусов
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