(adsbygoogle = window.adsbygoogle || []).push({}); The problem statement, all variables and given/known data

I'm supposed to verify this:

[tex]\frac{cos(2x)-cos(4x)}{sin(2x)+sin(4x)}=tanx[/tex]

The attempt at a solution

I reworked it every way I could think of, but it just won't work. I got desperate so I plugged it into some site and it said it was not a real identity, so I now I'm thinking maybe my teacher had a typo or something.

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# Homework Help: Verifying an Identity

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