Recent content by Harleyd2900

Whould this bring me anyware: cos²5x - cos²x = (-sin4x)(sin6x) (1-sin^2(5x)) - (1-sin^2x) = ?

You lost me.:eek: :confused:

Yes I know both of thoes. Thoes can be used on (\cos 5x - \cos x)(\cos 5x + \cos x) ? Whouldn't a cosx have to be on the outside of the () in order to use it?

Good hint. I see the difference of squares. Should I factor out a cosx now? BTW that x is a multiplication sign... sorry about that.

My Pre-Cal teacher gave us this problem today. I have worked on it for a very long time and have goten no where :confused:. I was wondering if anyone had any ideas on how to do it, or even where to start. I started it myself with using the pythagorean idenities for the left side, then the...