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fea681da | 1 | .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
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2 | .\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk |
3 | .\" <mtk.manpages@gmail.com> | |
fea681da | 4 | .\" |
93015253 | 5 | .\" %%%LICENSE_START(VERBATIM) |
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6 | .\" Permission is granted to make and distribute verbatim copies of this |
7 | .\" manual provided the copyright notice and this permission notice are | |
8 | .\" preserved on all copies. | |
9 | .\" | |
10 | .\" Permission is granted to copy and distribute modified versions of this | |
11 | .\" manual under the conditions for verbatim copying, provided that the | |
12 | .\" entire resulting derived work is distributed under the terms of a | |
13 | .\" permission notice identical to this one. | |
c13182ef | 14 | .\" |
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15 | .\" Since the Linux kernel and libraries are constantly changing, this |
16 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
17 | .\" responsibility for errors or omissions, or for damages resulting from | |
18 | .\" the use of the information contained herein. The author(s) may not | |
19 | .\" have taken the same level of care in the production of this manual, | |
20 | .\" which is licensed free of charge, as they might when working | |
21 | .\" professionally. | |
c13182ef | 22 | .\" |
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23 | .\" Formatted or processed versions of this manual, if unaccompanied by |
24 | .\" the source, must acknowledge the copyright and authors of this work. | |
4b72fb64 | 25 | .\" %%%LICENSE_END |
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26 | .\" |
27 | .\" References consulted: | |
28 | .\" Linux libc source code | |
29 | .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) | |
30 | .\" 386BSD man pages | |
31 | .\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu) | |
32 | .\" Modified 2002-07-27 by Walter Harms | |
33 | .\" (walter.harms@informatik.uni-oldenburg.de) | |
4b8c67d9 | 34 | .TH COS 3 2017-09-15 "" "Linux Programmer's Manual" |
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35 | .SH NAME |
36 | cos, cosf, cosl \- cosine function | |
37 | .SH SYNOPSIS | |
38 | .nf | |
39 | .B #include <math.h> | |
68e4db0a | 40 | .PP |
fea681da | 41 | .BI "double cos(double " x ); |
fea681da | 42 | .BI "float cosf(float " x ); |
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43 | .BI "long double cosl(long double " x ); |
44 | .fi | |
68e4db0a | 45 | .PP |
20c58d70 | 46 | Link with \fI\-lm\fP. |
68e4db0a | 47 | .PP |
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48 | .in -4n |
49 | Feature Test Macro Requirements for glibc (see | |
50 | .BR feature_test_macros (7)): | |
51 | .in | |
68e4db0a | 52 | .PP |
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53 | .ad l |
54 | .BR cosf (), | |
55 | .BR cosl (): | |
b90c43a8 | 56 | .RS 4 |
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57 | _ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L |
58 | || /* Since glibc 2.19: */ _DEFAULT_SOURCE | |
59 | || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE | |
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60 | .RE |
61 | .ad | |
fea681da | 62 | .SH DESCRIPTION |
5600f73a | 63 | These functions return the cosine of |
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64 | .IR x , |
65 | where | |
66 | .I x | |
67 | is | |
fea681da | 68 | given in radians. |
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69 | .SH RETURN VALUE |
70 | On success, these functions return the cosine of | |
71 | .IR x . | |
847e0d88 | 72 | .PP |
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73 | If |
74 | .I x | |
75 | is a NaN, a NaN is returned. | |
847e0d88 | 76 | .PP |
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77 | If |
78 | .I x | |
79 | is positive infinity or negative infinity, | |
efe294cb | 80 | a domain error occurs, |
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81 | and a NaN is returned. |
82 | .SH ERRORS | |
83 | See | |
84 | .BR math_error (7) | |
85 | for information on how to determine whether an error has occurred | |
86 | when calling these functions. | |
87 | .PP | |
88 | The following errors can occur: | |
89 | .TP | |
90 | Domain error: \fIx\fP is an infinity | |
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91 | .I errno |
92 | is set to | |
93 | .BR EDOM | |
94 | (but see BUGS). | |
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95 | An invalid floating-point exception |
96 | .RB ( FE_INVALID ) | |
97 | is raised. | |
ad6be0a4 | 98 | .SH ATTRIBUTES |
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99 | For an explanation of the terms used in this section, see |
100 | .BR attributes (7). | |
101 | .TS | |
102 | allbox; | |
103 | lbw21 lb lb | |
104 | l l l. | |
105 | Interface Attribute Value | |
106 | T{ | |
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107 | .BR cos (), |
108 | .BR cosf (), | |
ad6be0a4 | 109 | .BR cosl () |
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110 | T} Thread safety MT-Safe |
111 | .TE | |
47297adb | 112 | .SH CONFORMING TO |
9a74e018 | 113 | C99, POSIX.1-2001, POSIX.1-2008. |
847e0d88 | 114 | .PP |
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115 | The variant returning |
116 | .I double | |
117 | also conforms to | |
118 | SVr4, 4.3BSD. | |
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119 | .SH BUGS |
120 | Before version 2.10, the glibc implementation did not set | |
121 | .\" http://sources.redhat.com/bugzilla/show_bug.cgi?id=6780 | |
122 | .I errno | |
123 | to | |
124 | .B EDOM | |
125 | when a domain error occurred. | |
47297adb | 126 | .SH SEE ALSO |
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127 | .BR acos (3), |
128 | .BR asin (3), | |
129 | .BR atan (3), | |
130 | .BR atan2 (3), | |
36268806 | 131 | .BR ccos (3), |
fea681da | 132 | .BR sin (3), |
63a6644b | 133 | .BR sincos (3), |
fea681da | 134 | .BR tan (3) |