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    MikeC3322's Avatar
    MikeC3322 Posts: 1, Reputation: 1
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    #1

    Oct 3, 2010, 10:39 PM
    establishing identity
    I'm having trouble establishing this identity
    1-tan^2(x)/1+tan^2(x) = cos^2(x)-sin^2(x)
    any help would be much appreciated!
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
    Uber Member
    		  
    #2

    Oct 4, 2010, 01:00 AM

    First use:



    Then, convert tan and sec to sin and cos.

    This should be easy to finish.

    Is it okay? :)
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