I am looking for an identity to simplify the following:
I assume it will be something similar to the power reduction identity:
You can use the product to sum identity.
For a complete list of trignometric identities you can refer List of trigonometric identities - Wikipedia, the free encyclopedia
Hope this will help you.
I looked at that identity many times, but having the phase as part of one of the functions threw me. But all of sudden with your replay, I could see it clearly for some reason. It didn't dawn on me what A and B represented I guess, made it way harder than it was.
I got what I would expect, this is an amplitude modulation problem I was working on.