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
              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) built-in optimizations, using flags such as:

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

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

COLOPHON
       This  page  is  part of release 4.16 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest     version     of     this    page,    can    be    found    at
       https://www.kernel.org/doc/man-pages/.



GNU                               2017-09-15                         SINCOS(3)