Sine and Cosine Accuracy

[Olivier Galibert]

On Fri, May 27, 2005 at 12:26:13AM +0200, Gabriel Dos Reis wrote:
> If it was and angle!  Not everything that is an argument to sin or cos
> is an angle.  They are just functions!  Suppose you're evaluating an
> approximation of a Fourrier series expansion.

If you're evaluating it at the floating point value 2^90 you're just
evaluating a fancy prng.  Floating point values represent intervals,
and when the interval size is way bigger than 2pi any value in [-1,1]
is a perfectably acceptable answer for sin or cos.

  OG.