Asked by Agastya

Prove that [sinA/(1-cosA)-(1-cosA)/sinA]*[cosA/(1+sinA)+(1+sinA)/cosA]=4cosecA
I the second part as 2 secA
Answered by Steve
sinA/(1-cosA) = cot(A/2)

that should help.

you are correct on the 2nd term.