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    flameruckus's Avatar
    flameruckus Posts: 93, Reputation: 2
    Junior Member
    		  
    #1

    Apr 26, 2009, 01:50 PM
    a trig identity/proof, csc and cot
    1 - cot^4x = 2csc²x - csc^4x

    the ^4 means to the fourth power. The x's are not supposed to be raised.
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
    Ultra Member
    		  
    #2

    Apr 26, 2009, 05:25 PM
    On the left side of the parentheses, rewrite:





    Now, expand and you will see it.
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