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    chitorex's Avatar
    chitorex Posts: 2, Reputation: 1
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    #1

    Sep 12, 2012, 09:24 AM
    proving identities calculator
    sin2A-cos2A= 2cos2Atan@A-1
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Sep 12, 2012, 09:32 AM
    You identity formula is incorrect. Not sure whether you meant this:



    or this:



    But neither of these formulas is correct.
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