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);
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 especially 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.
See attributes(5) for descriptions of the following attributes:
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asin(3M), acos(3M), atan(3M), atan2(3M), cos(3M), sin(3M), sincos(3M), sind(3M), sinp(3M), tan(3M), attributes(5)