How would I go about solving
I have already tried cross-multiplying, but that didn't work out too well
sorry guys its not solving, and my first steps were wrong. Im just trying to prove it true. so, I have to manipulate one side to look like the other. I have expanded cos(2x) and sin(2x) with the double angle identities, but still can't get it to look like
Generally you would be asked to prove that both sides are the same.
Solving, on the other hand generally means that the two sides are equal for some specific value(s) of x.
The two sides are not equal in general, but we can look for the value(s) of x for which they are equal.