CosB*tgB/sin^2 - ctgB*cosB

Question

CosB*tgB/sin^2 - ctgB*cosB

Answer 1

Расскрыв тангенг и котангенс получим:
(cos(b)*sin(b)/cos(b))/sin^2(b)-cos^2(b)/sin(b)=(1-cos^2(b))/sin(b)=sin^2(b)/sin(b)=sin(b)
Ответ.sin(b)