SINCOS(3)                 Linux Programmer's Manual                SINCOS(3)

NAME         top

       sincos, sincosf, sincosl - calculate sin and cos simultaneously

SYNOPSIS         top

       #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         top

       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         top

       These functions return void.

ERRORS         top

       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         top

       These functions first appeared in glibc in version 2.1.

ATTRIBUTES         top

       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         top

       These functions are GNU extensions.

NOTES         top

       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         top

       cos(3), sin(3), tan(3)

COLOPHON         top

       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)

Pages that refer to this page: cos(3),  sin(3)

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