x87 trig functions can be very inaccurate due to the Intel's original sloppy implementation and subsequent compatibility requirements [1]. [1] http://nighthack

x87 trig functions can be very inaccurate due to the Intel's original sloppy implementation and subsequent compatibility requirements [1]. [1] http://nighthacks.com/jag/blog/134/index.html http://nighthacks.com/jag/blog/134/index.html