proving a trig identity

[ahabib1]

prove

0=cos2x(1-1/4 2x) if someone could please answer this for me it would be greatly appreciated. have a test tomorrow and i'm confused about how to prove this

 

[Dr.Peterson]

prove

0=cos2x(1-1/4 2x) if someone could please answer this for me it would be greatly appreciated. have a test tomorrow and i'm confused about how to prove this

I'm not sure how to interpret that equation. Do you mean [MATH]0=\cos(2x)\left(1-\frac{1}{4}2x\right)[/MATH], or [MATH]0=\cos^2\left(x\left(1-\frac{1}{4}2x\right)\right)[/MATH], or what?

In any case, it doesn't look like an identity to me!

It may help if you post an image of the actual problem.