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Math Help - Trigonometry

  1. #1
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    Trigonometry

    Prove the following identity:
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  2. #2
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    Re: Trigonometry

    have you attempted anything yourself yet? I would recommended factoring it to start.
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  3. #3
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    Re: Trigonometry

    The identity 1+tan^2A=sec^2A will also be useful
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  4. #4
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    Re: Trigonometry

    The given expression is 1-( Sec2A-Tan2A)2=1-12=0
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  5. #5
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    Re: Trigonometry

    LHS = 1 - ( sec^4A - 2 sec^2 A tan^2 A + tan^4 A )
    = 1 - ( sec ^2 A - tan ^2 A )^2 = 1 - 1 = 0 = RHS
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