Question

скоротити вираз: $3 cos\alpha * tg\alpha - 2sin\alpha$

Answer 1

$3\cos \alpha \cdot \mathrm{tg}\alpha -2\sin \alpha =3\cos\alpha \cdot \cfrac{\sin \alpha}{\cos \alpha}-2\sin \alpha=3\sin \alpha-2\sin \alpha=\sin \alpha$