Math Is Fun Forum

lisa123

Member

Registered: 2007-11-11

Posts: 5

Prove identity

:oprove the identity
(1-sin^2beta)(1+sin^2beta)=2cos^2beta - cos^4 beta

TheDude

Member

Registered: 2007-10-23

Posts: 361

Re: Prove identity

Use the trigonometric identity

This identity alone will solve your problem.

---

Wrap it in bacon

lisa123

Member

Registered: 2007-11-11

Posts: 5

Re: Prove identity

That was the trick....thank you for your help.