SINCOS(3)                                                               Linux Programmer's Manual                                                              SINCOS(3)

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

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);

       Link with -lm.

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.

VERSIONS
       These functions first appeared in glibc in version 2.1.

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

       ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │Interface                                                                                                                             │ Attribute     │ Value   │
       ├──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │sincos(), sincosf(), sincosl()                                                                                                        │ Thread safety │ MT-Safe │
       └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

CONFORMING TO
       These functions are GNU extensions.

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

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

GNU                                                                            2021-03-22                                                                      SINCOS(3)