Question

prove identity of
(sinx)(cotx+cosxtanx)=cosx + (sin^2)x

Answer 1

There is an identity for sin(2x). Please find it and write it out on the right side of your equation. Compare the left and right sides.

Answer 2

it is 1-(cos^2)x , I still don't know what to do after @mathmale

Answer 3

You can set cotx as cosx/sinx

Answer 4

And tanx as sinx/cosx