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

cot - котангенс

Answer 3

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