Question

Упростите выражение:
sin α · ctg α

Answer 1

$\sin(a) \times \cot(a) = \sin(a) \times \frac{ \cos(a) }{ \sin(a) } = \cos(a)$

Answer 2

$\sin \alpha \times ctg \: a = \sin\alpha \times \frac{cos \: a}{sin \: a} = cos \: a$