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Thread: Trigonometric sum.

  1. January 15th 2011, 08:07 PM #1
    jacks
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    Trigonometric sum.

    Calculate tan(\frac{\pi}{11})+tan(\frac{2\pi}{11})+tan(\frac {3\pi}{11})+tan(\frac{4\pi}{11})+tan(\frac{5\pi}{1 1})=
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  2. January 15th 2011, 08:31 PM #2
    pickslides
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    Have a look at this link...

    Trigonometry Angles--Pi/11 -- from Wolfram MathWorld
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