Thanks, I appreciate the help. I guess I was doubting myself that it was that simple.
I do have another two that I am not sure about if you could help:
Question 1: Express as a sum or difference 2sin(6u)cos(4u).
I think it's either sin(10u)-sin(2u) or sin(10u)+sin(2u), not too sure.
Question 2: Express as a product sin(6t) + sin(2t).
I think it's either 2sin(4t)cos(2t) or 2cos(4t)sin(2t), again not sure.
Thanks for any advice.