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    ellenpink's Avatar
    ellenpink Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Nov 26, 2011, 12:56 PM
    how do I prove this identity
    (3-4cos(2x) cos(4x))÷(3 4cos(2x) cos(4x))=tan^(4)(x)
    corrigan's Avatar
    corrigan Posts: 115, Reputation: 18
    Junior Member
    		  
    #2

    Nov 26, 2011, 10:11 PM
    Try retyping the question. I don't know exactly what you are asking.
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