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)