Let's verify the identity

What is a quick way to simplify the previous equation?

** A. ** ** B. ** ** C. ** ** D. ** ** E. ** ** F. ** None of the above

What do we get when we rewrite the right-hand side purely in terms of sine and cosine?

** A. ** ** B. ** ** C. ** ** D. ** ** E. ** ** F. ** ** G. ** ** H. ** None of the above

How can we finish the proof?

** A. ** We apply the Pythagorean Identity to make both sides equal.** B. ** We apply the double angle formula for cosine after simplifying.** C. ** After simplifying the previous equation, we are left with the definition of secant.** D. ** After simplifying, we get the get double angle formula for sine.** E. ** None of the above