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[Wang <>]

Please excuse my poor English, I am Chinese.  :D ) 

Hello,
In the Loop subdivision implementation in Subdivision_mask_3.h, the value (n *
beta) is computed as:
FT Cn = (FT) (5.0/8.0 - std::sqrt(3+2*std::cos(6.283/n))/64.0);
(line 242). 
In the Loop subdivision algorithm, the degree of the value
(3+2*std::cos(6.283/n) ) should be 2 instand of 1/2. Anyone can give me an
explanation? Thanks!