anyone knows this? I need it now 7/9/2014 | Tran from Schenectady, NY | 1 Answer | 0 Votes Mark favorite Subscribe Comment
You need the half angle formulas. sin(x/2) = sqrt( (1-cos(x) ) /2 ) cos(x/2) = sqrt( (1 + cos(x) )/2) There can be a ± in front of the square roots in some situations. 7/9/2014 | Richard P. Comment Comments do you it = sin(?) 7/9/2014 | Tran from Schenectady, NY Comment
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