SOLUTION: tan(11pi/12)

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Question 1155174: tan(11pi/12)
Answer by ikleyn(52887) About Me  (Show Source):
You can put this solution on YOUR website!
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tan%2811pi%2F12%29 = -tan%28pi%2F12%29 = -tan(15°) = -(2 - sqrt%283%29) = sqrt%283%29-2 = -0.26795  (approximately).   ANSWER

See the lesson
    - Trigonometric functions of half argument - Examples,   Example  2
in this site.