SIMPLE SOLUTIONS

COS(3) - Linux man page online | Library functions

Cosine function.

Chapter
2017-09-15
COS(3) Linux Programmer's Manual COS(3)

NAME

cos, cosf, cosl - cosine function

SYNOPSIS

#include <math.h> double cos(double x); float cosf(float x); long double cosl(long double x); Link with -lm. Feature Test Macro Requirements for glibc (see feature_test_macros(7)): cosf(), cosl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION

These functions return the cosine of x, where x is given in radians.

RETURN VALUE

On success, these functions return the cosine of x. If x is a NaN, a NaN is returned. If x is positive infinity or negative infinity, a domain error occurs, and a NaN is returned.

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 errno is set to EDOM (but see BUGS). An invalid floating-point exception (FE_INVALID) is raised.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7). ┌──────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├──────────────────────┼───────────────┼─────────┤ │cos(), cosf(), cosl() │ Thread safety │ MT-Safe │ └──────────────────────┴───────────────┴─────────┘

CONFORMING TO

C99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD.

BUGS

Before version 2.10, the glibc implementation did not set errno to EDOM when a domain error occurred.

SEE ALSO

acos(3), asin(3), atan(3), atan2(3), ccos(3), sin(3), sincos(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/.
2017-09-15 COS(3)
This manual Reference Other manuals
cos(3) referred by acos(3) | asin(3) | atan(3) | atan2(3) | dlopen(3) | exupdate(3alleg4) | Math::GSL::Min(3pm) | sin(3) | sincos(3) | tan(3)
refer to acos(3) | asin(3) | atan(3) | atan2(3) | attributes(7) | ccos(3) | feature_test_macros(7) | math_error(7) | sin(3) | sincos(3) | tan(3)
Download raw manual
Main page Linux Programmer's Manual (+2508) № 3 (+68044)
Go top