From: tkoenig@netcologne.de   
      
   BGB  schrieb:   
      
   > double sin(double ang)   
   > {   
   > 	double t, x, th, th2;   
   > 	int i;   
   > 	i=ang*M_TAU_R;   
   > 	th=ang-(i*M_TAU);   
   > 	th2=th*th;   
      
   That leaves a lot of room for improvement; you would be better   
   off reducing to [-pi/4,+pi/4].  See   
   https://userpages.cs.umbc.edu/phatak/645/supl/Ng-ArgReduction.pdf   
   for a random reference grabbed off the net how to do it.   
      
   [...]   
      
   > Time cost: roughly 450 clock cycles (penalties are steep on this one).   
      
   What is your accuracy?   
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