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Math Help - Trigonometry

  1. #1
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    Trigonometry

    simplify the following. sin(7π/12) + cos(-π/12)
    final answer must be EXACT

    please show all work.
    Thanks
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  2. #2
    Behold, the power of SARDINES!
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    Quote Originally Posted by meli3000 View Post
    simplify the following. sin(7π/12) + cos(-π/12)
    final answer must be EXACT

    please show all work.
    Thanks

    Here is a hint:

    \frac{\pi}{3}+\frac{\pi}{4}=\frac{7\pi}{12} and

    \frac{\pi}{4}-\frac{\pi}{3}=\frac{-\pi}{12}

    Think sum and difference identities.

    Good luck.
    Last edited by TheEmptySet; June 12th 2008 at 05:25 PM. Reason: typo
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  3. #3
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    Quote Originally Posted by TheEmptySet View Post

    \frac{\pi}{3}+\frac{\pi}{4}=\frac{7\pi}{4}
    Should be \frac{\pi}{3}+\frac{\pi}{4}=\frac{7\pi}{12}
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