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## Homework Statement

I have to prove that 3A=(cos(2A)-cos(4A))/(sin(4A)-sin(2A))

## Homework Equations

All of the trig identites.

## The Attempt at a Solution

Well, I know I can expand tan(3A) to sin(3A)/cos(3A). After this, I have no idea what to do. I do not know any way to simplify or expand the right side of the equation. If someone can help me out by just showing the me the first step, if possible, then I can try to solve the rest of the identity by myself.

Thanks!