Because i changed 3-4 of my multiple choice answers by placing the X on it and selecting a new one. I hope the computer doesn't stuff up and mark it wrong.
Prove that:
Cos2a = (1-tan^2a)/(1+tan^2a)
This was my proof, tell me if its ok please.
t = tan(a/2)
Cosa = (1-t^2)/(1+t^2)
but a = 2a
therefore cos2a = (1-tan^2a)/(1+tan^2a) as t = tan(2a/2) = tan(a)
Thanks
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