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Thread: trigonometry

  1. September 22nd 2008, 07:44 PM #1
    maeca
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    trigonometry

    what is the value of sin Π/5 and cos Π/5?
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  2. September 22nd 2008, 07:57 PM #2
    Shyam
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    Quote Originally Posted by maeca View Post
    what is the value of sin Π/5 and cos Π/5?
    \sin {\frac{\pi}{5}}= \frac{\sqrt{10-2 \sqrt{5}}}{4}

    \cos {\frac{\pi}{5}}= \frac {\sqrt{5}+1}{4}<br />
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