SOLUTION: Please help me verify the identity: 1-tan^2t/1+tan^2t= 2cos^2-1.

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Question 743369: Please help me verify the identity:
1-tan^2t/1+tan^2t= 2cos^2-1.
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
Please help me verify the identity:
%281-tan%5E2%28t%29%29%2F%281%2Btan%5E2%28t%29%29=+2cos%5E2%28t%29-1
start with left side:
%281-tan%5E2%28t%29%29%2F%281%2Btan%5E2%28t%29%29
%281-sin%5E2%28t%29%2Fcos%5E2%28t%29%29%2F%281%2Bsin%5E2%28t%29%2Fcos%5E2%28t%29%29

verified: left side=right side