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():
20           _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
21           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
22           or cc -std=c99
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DESCRIPTION

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

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

37       See math_error(7) for information on how to determine whether an  error
38       has occurred when calling these functions.
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40       The following errors can occur:
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42       Domain error: x is an infinity
43              errno  is set to EDOM (but see BUGS).  An invalid floating-point
44              exception (FE_INVALID) is raised.
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CONFORMING TO

47       C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
48       4.3BSD.
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BUGS

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

55       acos(3), asin(3), atan(3), atan2(3), ccos(3), sin(3), sincos(3), tan(3)
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COLOPHON

58       This page is part of release 3.53 of the Linux  man-pages  project.   A
59       description  of  the project, and information about reporting bugs, can
60       be found at http://www.kernel.org/doc/man-pages/.
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64                                  2010-09-11                            COS(3)
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