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) builtin 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 4.15 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)