SOLUTION: how do you prove the identity of: cos^2(5x)-sin^2(5x)=cos10x

Question 597992: how do you prove the identity of:
cos^2(5x)-sin^2(5x)=cos10x
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
how do you prove the identity of:
cos^2(5x)-sin^2(5x)=cos10x
**
use identity: cos^2x-sin^2x=cos2x
cos^2(5x)-sin^2(5x)=cos10x
verified:
left side=right side
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