**sincos**

**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)**

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