atan2pi man page on OpenIndiana

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sinpi(3M)							     sinpi(3M)

NAME
       sinpi,  sinpif,	sinpil,	 cospi, cospif, cospil, tanpi, tanpif, tanpil,
       sincospi,  sincospif,  sincospil,  asinpi,  asinpif,  asinpil,  acospi,
       acospif, acospil, atanpi, atanpif, atanpil, atan2pi, atan2pif, atan2pil
       - trigonometric functions scaled by pi

SYNOPSIS
       cc [ flag ... ] file ...	 -lsunmath -lm [ library ... ]

       #include <sunmath.h>

       double sinpi(double x);

       float sinpif(float x);

       long double sinpil(long double x);

       double cospi(double x);

       float cospif(float x);

       long double cospil(long double x);

       double tanpi(double x);

       float tanpif(float x);

       long double tanpil(long double x);

       void sincospi(double x, double *s, double *c);

       void sincospif(float x, float *s, float *c);

       void sincospil(long double x, long double *s, long double *c);

       double asinpi(double x);

       float asinpif(float x);

       long double asinpil(long double x);

       double acospi(double x);

       float acospif(float x);

       long double acospil(long double x);

       double atanpi(double x);

       float atanpif(float x);

       long double atanpil(long double x);

       double atan2pi(double y, double x);

       float atan2pif(float y, float x);

       long double atan2pil(long double y, long double x);

DESCRIPTION
       sinpi(x), cospi(x), and tanpi(x)	 compute  trigonometric	 functions  of
       angles  measured	 in  multiples of pi radians: sinpi(x) := sin(x * pi),
       and similarly for cospi(x) and tanpi(x).	  These	 functions  are	 espe‐
       cially  useful when the argument x is large, since the reduction to the
       primary range can be peformed exactly and very fast.

       sincospi(x, s, c) simultaneously sets *s = sinpi(x) and *c = cospi(x).

       The corresponding inverse functions compute asinpi(x) := asin(x) /  pi,
       and  similarly  for  acospi(x)  and  atanpi(x).	Also, atan2pi(y, x) :=
       atan2(y, x) / pi.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌────────────────────┬─────────────────┐
       │  ATTRIBUTE TYPE    │ ATTRIBUTE VALUE │
       ├────────────────────┼─────────────────┤
       │Interface Stability │ Committed	      │
       │MT-Level	    │ MT-Safe	      │
       └────────────────────┴─────────────────┘
SEE ALSO
       asin(3M), acos(3M), atan(3M), atan2(3M), cos(3M), sin(3M),  sincos(3M),
       sind(3M), sinp(3M), tan(3M), attributes(5)

				  14 Mar 2009			     sinpi(3M)
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