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Math Help - addition or subtraction for cofunction identity

  1. #1
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    Exclamation addition or subtraction for cofunction identity

    I have no idea how to work this problem using addition or subtraction theories

    (x-n) = -sin x

    Thanks!
    Last edited by pmacp; May 7th 2010 at 04:57 PM.
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  2. #2
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    Quote Originally Posted by pmacp View Post
    I have no idea how to work this problem using addition or subtraction theories

    (x-n) = -sin x

    Thanks!
    What are you trying to do? What is the whole the question verbatim?
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  3. #3
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    Prove the confunction identity sin (x - π) = -sin x using the addition or subtraction formulas.
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  4. #4
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    sin(x-\pi)=sin(x)cos(\pi)-cos(x)sin(\pi)=-sin(x)
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  5. #5
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    thank you!
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