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.

VERSIONS

       These functions were added in glibc 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 │
       └───────────────────────────────────────────────────────────────┴───────────────┴─────────┘

STANDARDS

       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  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)