sincos, sincosf, sincosl — calculate sin and cos simultaneously


#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.


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.


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.


These functions first appeared in glibc in version 2.1.


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.


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)


This page is part of release 5.04 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

Referenced By

cos(3), sin(3).

The man pages sincosf(3) and sincosl(3) are aliases of sincos(3).

2017-09-15 GNU Linux Programmer's Manual