SOLUTION: Prove the identity: COS 2X-1/1+COS X = 2COS X - 2

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Question 923730: Prove the identity:
COS 2X-1/1+COS X = 2COS X - 2
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
Prove the identity:
COS 2X-1/1+COS X = 2COS X - 2
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=2cosx-2
verified:left side=right side