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SINCOS(3) Library Functions Manual SINCOS(3)

sincos, sincosf, sincosl
sine and cosine functions

#include <math.h>
sincos(double x, double *s, double *c);
sincosf(float x, float *s, float *c);
sincosl(long double x, long double *s, long double *c);

The sincos(), sincosf(), and sincosl() functions compute the sine and cosine of x. Using these functions allows argument reduction to occur only once instead of twice with individual invocations of sin() and cos(). Like sin() and cos(), a large magnitude argument may yield a result with little or no significance.

Upon returning from sincos(), sincosf(), and sincosl(), the objects pointed to by *s and *c are assigned the values of sine and cosine, respectively.

cos(3), sin(3)

These functions first appeared in OpenBSD 6.3.
March 10, 2018 OpenBSD-current