• July 3rd 2011, 03:14 AM
scounged
Is this equality valid? I just noticed it, and I haven't heard of it before.

$2cos(\frac{\pi }{5})=\varphi,~where~\varphi~is~the~golden~ratio.$
• July 3rd 2011, 03:33 AM
mr fantastic
$2cos(\frac{\pi }{5})=\varphi,~where~\varphi~is~the~golden~ratio.$