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    mwilt's Avatar
    mwilt Posts: 3, Reputation: 1
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    #1

    Mar 4, 2009, 03:04 PM
    trigonometry proofs
    how do you prove that

    tanx+coty / tanxcoty = tany+cotx
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Mar 4, 2009, 03:50 PM


    This only requires about one step.

    Expand it out and look at the cancellations.



    See it?
    mwilt's Avatar
    mwilt Posts: 3, Reputation: 1
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    #3

    Mar 4, 2009, 08:52 PM

    Thank you! I get it now!
    cazey's Avatar
    cazey Posts: 1, Reputation: 1
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    #4

    Jun 9, 2009, 07:01 PM

    how do I prove that sin20=x/8?
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #5

    Jun 9, 2009, 07:42 PM

    If I read your question correctly,



    That looks more like an equation than a proof.
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