sincos(3)                  Library Functions Manual                  sincos(3)

NAME
       sincos, sincosf, sincosl - calculate sin and cos simultaneously

LIBRARY
       Math library (libm, -lm)

SYNOPSIS
       #define _GNU_SOURCE         /* See feature_test_macros(7) */
       #include <math.h>

       void sincos(double x, double *sin, double *cos);
       void sincosf(float x, float *sin, float *cos);
       void sincosl(long double x, long double *sin, long double *cos);

DESCRIPTION
       Several applications need sine and cosine of the same angle x.  These
       functions compute both at the same time, and store the results in *sin
       and *cos.  Using this function can be more efficient than two separate
       calls to sin(3) and cos(3).

       If x is a NaN, a NaN is returned in *sin and *cos.

       If x is positive infinity or negative infinity, a domain error occurs,
       and a NaN is returned in *sin and *cos.

RETURN VALUE
       These functions return void.

ERRORS
       See math_error(7) for information on how to determine whether an error
       has occurred when calling these functions.

       The following errors can occur:

       Domain error: x is an infinity
              errno is set to EDOM (but see BUGS).  An invalid floating-point
              exception (FE_INVALID) is raised.

ATTRIBUTES
       For an explanation of the terms used in this section, see
       attributes(7).

       +--------------------------------------------+---------------+---------+
       |Interface                                   | Attribute     | Value   |
       +--------------------------------------------+---------------+---------+
       |sincos (), sincosf (), sincosl ()           | Thread safety | MT-Safe |
       +--------------------------------------------+---------------+---------+
STANDARDS
       GNU.

HISTORY
       glibc 2.1.

NOTES
       To see the performance advantage of sincos(), it may be necessary to
       disable gcc(1) built-in optimizations, using flags such as:

           cc -O -lm -fno-builtin prog.c

BUGS
       Before glibc 2.22, the glibc implementation did not set errno to EDOM
       when a domain error occurred.

SEE ALSO
       cos(3), sin(3), tan(3)

Linux man-pages 6.7               2023-10-31                         sincos(3)