1.\" Copyright (c) 1991 The Regents of the University of California.
2.\" All rights reserved.
3.\"
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5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
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25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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32.\" from: @(#)cos.3 5.1 (Berkeley) 5/2/91
33.\" $Id: cos.3,v 1.5 1993/10/29 22:57:25 jtc Exp $
34.\"
35.Dd May 2, 1991
36.Dt COS 3
37.Os
38.Sh NAME
39.Nm cos
40.Nd cosine function
41.Sh SYNOPSIS
42.Fd #include <math.h>
43.Ft double
44.Fn cos "double x"
45.Sh DESCRIPTION
46The
47.Fn cos
48function computes the cosine of
49.Fa x
50(measured in radians).
51A large magnitude argument may yield a result with little or no
52significance.
53For a discussion of error due to roundoff, see
54.Xr math 3 .
55.Sh RETURN VALUES
56The
57.Fn cos
58function returns the cosine value.
59.Sh SEE ALSO
60.Xr sin 3 ,
61.Xr tan 3 ,
62.Xr asin 3 ,
63.Xr acos 3 ,
64.Xr atan 3 ,
65.Xr atan2 3 ,
66.Xr sinh 3 ,
67.Xr cosh 3 ,
68.Xr tanh 3 ,
69.Xr math 3
70.Sh STANDARDS
71The
72.Fn cos
73function conforms to
74.St -ansiC .