cos(3) - f14

1COS(3)                     Linux Programmer's Manual                    COS(3)
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NAME

6       cos, cosf, cosl - cosine function
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SYNOPSIS

9       #include <math.h>
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11       double cos(double x);
12       float cosf(float x);
13       long double cosl(long double x);
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15       Link with -lm.
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17   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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19       cosf(), cosl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
20       _ISOC99_SOURCE; or cc -std=c99
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DESCRIPTION

23       The cos() function returns the cosine of x, where x is given  in  radi‐
24       ans.
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RETURN VALUE

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

35       See math_error(7) for information on how to determine whether an  error
36       has occurred when calling these functions.
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38       The following errors can occur:
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40       Domain error: x is an infinity
41              An invalid floating-point exception (FE_INVALID) is raised.
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43       These functions do not set errno.
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CONFORMING TO

46       C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
47       4.3BSD.
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COLOPHON

53       This page is part of release 3.25 of the Linux  man-pages  project.   A
54       description  of  the project, and information about reporting bugs, can
55       be found at http://www.kernel.org/doc/man-pages/.
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59                                  2009-02-04                            COS(3)