SOLUTION: tan -15 degree exact value ?

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Question 1048639: tan -15 degree exact value ?
Answer by ikleyn(52786) About Me  (Show Source):
You can put this solution on YOUR website!
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tan(-15°) = tan(15°) = sqrt%282-sqrt%283%29%29%2Fsqrt%282%2Bsqrt%283%29%29 = 2-sqrt%283%29.

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