Posted by **Anonymous** on Sunday, April 15, 2012 at 12:01am.

Prove the identity: cos^4(x)-sin^4(x)=1-2sin^2(x).with explanation

im confused on this one cause of the 4th power of the sine. does this mean that we put it in the calculator 4 times? and what exactly does it mean by prove the identity- does it mean like make sure both sides equal each other?

## Answer This Question

## Related Questions

- Math- Trig - 1. Determine the exact value of cos^-1 (pi/2). Give number and ...
- Math - Prove each identity: a) 1-cos^2x=tan^2xcos^2x b) cos^2x + 2sin^2x-1 = sin...
- Math - Calculus - The identity below is significant because it relates 3 ...
- Pre-Calculus - I don't understand,please be clear! Prove that each equation is ...
- Math help please - Prove this identity using the product-to-sum identity for ...
- Pre-Calculus - Prove that each equation is an identity. I tried to do the ...
- calculus II - ∫ tan^2 x sec^3 x dx If the power of the secant n is odd, ...
- Math pre cal - prove the following identity cos^4X - sin^4X = 1-2sin^2X
- MATH - Hi, I really need help with these questions. I did some of them halfway, ...
- Precal - I do not understand how to do this problem ((sin^3 A + cos^3 A)/(sin A...

More Related Questions