Question

prove that LHS = RHS

Answer 1

(cota- coseca)^2
(cosa/sina-1/sina)^2
(cosa-1/sina)^2
(cosa-1)^2/sina^2
(cosa-1)^2/(1-cosa)^2
1-cosa/1+cosa

Answer 2

Answer in the image.

you have to solve both sides LHS and RHS.