COS(3) - man page online | library functions

Cosine function.

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(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99
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)
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2015-04-19 COS(3)
This manual Reference Other manuals
cos(3) referred by acos(3) | asin(3) | atan(3) | atan2(3) | dlopen(3) | exupdate(3alleg4) | 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)