Question

Найти котангенс альфа.
$frac{2cos alpha - 3sin alpha }{2sin alpha +5cos alpha } =7$

Answer 1

2cosa-3sina=14sina+35cosa
14sina+35cosa-2cosa+3sina=0
17sina+33cosa=0/cosa≠0
17tga+33=0
tga=-33/17
ctga=-17/33