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    Jordana21's Avatar
    Jordana21 Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Jun 8, 2009, 10:49 PM
    Trig Identities, Grade 11
    Hey all, I've completely stuck on this one trig identity problem, I hope someone can help!

    tanx - 1 = (sin^2x - cos^2x)/(sinxcosx + cos^2x)

    I've figured that the left side should probably be:

    tanx - 1

    = sinx/cosx - 1/1

    = sinx-cosx/cosx

    But I can't get the other side to that point.

    Thanks in advance!
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #2

    Jun 9, 2009, 05:14 AM

    does this identity help?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
    Uber Member
    		  
    #3

    Jun 9, 2009, 09:11 AM

    Try doing your problem from right to left, that is, try making



    into

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