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    michtheunicorn's Avatar
    michtheunicorn Posts: 1, Reputation: 1
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    #1

    Mar 29, 2012, 06:23 PM
    Prove the Identity: 2cos^2x-1=(1-tan^2x)/(1 tan^2x)
    2cos^2x-1=(1-tan^2x)/(1 + tan^2x)
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Mar 30, 2012, 05:10 AM
    Convert tanx to sinx/cosx, and remember that sin^2x = 1 - cos^2x. It works out nicely.
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