Trigonometric sum.

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January 15th 2011, 08:07 PM
jacks

Trigonometric sum.

Calculate $tan(\frac{\pi}{11})+tan(\frac{2\pi}{11})+tan(\frac {3\pi}{11})+tan(\frac{4\pi}{11})+tan(\frac{5\pi}{1 1})=$
January 15th 2011, 08:31 PM
pickslides

Have a look at this link...

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

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