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           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
21               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
22               || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
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DESCRIPTION

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

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

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

46       For  an  explanation  of  the  terms  used   in   this   section,   see
47       attributes(7).
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49       ┌──────────────────────┬───────────────┬─────────┐
50       │Interface             │ Attribute     │ Value   │
51       ├──────────────────────┼───────────────┼─────────┤
52       │cos(), cosf(), cosl() │ Thread safety │ MT-Safe │
53       └──────────────────────┴───────────────┴─────────┘

CONFORMING TO

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

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

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

67       This page is part of release 4.16 of the Linux  man-pages  project.   A
68       description  of  the project, information about reporting bugs, and the
69       latest    version    of    this    page,    can     be     found     at
70       https://www.kernel.org/doc/man-pages/.
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74                                  2017-09-15                            COS(3)
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