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为什么我的公式就这么长……

Posted by hmlog at 2008-08-02 23:56:46 on Problem 1799 and last updated at 2008-08-02 23:57:40 
r = R/(sin((PI-2.0*PI/n)/2.0)/sin(2.0*PI/n)+1.0/2.0)/2.0 ; (n>2)
  = 1.0*R/n ; (n<=2)
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