SOLUTION: verify identity cos^2x-2sin^2x=3cos^2x-2

SOLUTION: verify identity cos^2x-2sin^2x=3cos^2x-2

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Question 441181: verify identity
cos^2x-2sin^2x=3cos^2x-2
Answer by Gogonati(855) (Show Source): You can put this solution on YOUR website!
We simplify the left side of the identity:
= as you see we get
the same expression as the right side, thus the identity is true.
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