Let's verify the identity

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

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

How can we simplify the previous equation?

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

How can we apply the Pythagorean Identity here?

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

How can we finish the proof?

** A. ** After applying the double angle formula, both sides become equal.** B. ** After simplifying, we obtain the double angle formula for sine.** C. ** After applying the Pythagorean Identity again, both sides become equal.** D. ** After simplifying the left-hand side, both sides are equal.** E. ** None of the above