SOLUTION: Prove 1-tan^2 x/2 = 2cosx/ 1+ cosx

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Question 928604: Prove 1-tan^2 x/2 = 2cosx/ 1+ cosx
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
Prove 1-tan^2 x/2 = 2cosx/ 1+ cosx
start with left side:
Identity: tan(x/2)=sinx/(1+cosx)

verified: left side=right side