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* software is freely granted, provided that this notice
* Input y is the tail of x.
*
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*
* 4 6 8 10 12 14
* since cos(x+y) ~ cos(x) - sin(x)*y
static const double
static double
int32_t ix;
if(ix < 0x3FD33333) /* if |x| < 0.3 */
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