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Thread: Trig identities

  1. September 30th 2009, 01:56 PM #1
    rainer
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    Trig identities

    Do trig identities exist for any other numbers besides 1, i, and e?
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  2. September 30th 2009, 02:39 PM #2
    Krizalid
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    of course, for example \sin x=\frac{e^{ix}-e^{-ix}}{2i}.

    google and you'll see more.
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  3. September 30th 2009, 05:40 PM #3
    pacman
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    check this: List of trigonometric identities - Wikipedia, the free encyclopedia
    Chebyshev polynomials - Wikipedia, the free encyclopedia
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