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    mucky02's Avatar
    mucky02 Posts: 1, Reputation: 1
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    #1

    Oct 2, 2007, 10:44 PM
    trigonometric identities
    hey guys help me to prove this one (sintheta-tantheta)square=(tan square theta)(cos theta-1)square
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Oct 3, 2007, 04:16 PM


    Use the identity:

    Hammer it into shape.

    When it looks like:



    you're there.

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