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
              An invalid floating-point exception (FE_INVALID) is raised.

       These functions do not set errno.

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)
       builtin optimizations, using flags such as:

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

SEE ALSO

       cos(3), sin(3), tan(3)

COLOPHON

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