I'll write x instead of theta
Put the left hand side onto a common denominator of (1-sinx)(1+sinx) and simplify your numerator.
Note this common denominator will also simplify to 1-sin^2x which= cos^2x
I need some help getting started with proving this identity problem. Everytime I get started I feel like I am just making it uglier
((1 +sin theta)/(1-sin theta))-((1-sin theta)/(1+sin theta)=4*tan theta*sec theta
Thanks for your help!