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Math Help - About the golden ratio

  1. #1
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    About the golden ratio

    Is this equality valid? I just noticed it, and I haven't heard of it before.

    2cos(\frac{\pi }{5})=\varphi,~where~\varphi~is~the~golden~ratio.
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  2. #2
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    Re: About the golden ratio

    Quote Originally Posted by scounged View Post
    Is this equality valid? I just noticed it, and I haven't heard of it before.

    2cos(\frac{\pi }{5})=\varphi,~where~\varphi~is~the~golden~ratio.
    Found using Google in t < 60 seconds:

    http://www.theproblemsite.com/thegol...igonometry.asp

    Golden ratio and special angles — The Endeavour
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