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+.\" Copyright (c) 1991 The Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     from: @(#)cos.3	5.1 (Berkeley) 5/2/91
+.\"	$Id: cos.3,v 1.1.1.1 1995/10/18 08:42:49 deraadt Exp $
+.\"
+.Dd May 2, 1991
+.Dt COS 3
+.Os
+.Sh NAME
+.Nm cos
+.Nd cosine function
+.Sh SYNOPSIS
+.Fd #include <math.h>
+.Ft double
+.Fn cos "double x"
+.Ft float
+.Fn cosf "float x"
+.Sh DESCRIPTION
+The
+.Fn cos
+and
+.Fn cosf
+functions compute the cosine of
+.Fa x
+(measured in radians).
+A large magnitude argument may yield a result with little or no 
+significance.
+For a discussion of error due to roundoff, see
+.Xr math 3 .
+.Sh RETURN VALUES
+The
+.Fn cos
+function returns the cosine value.
+.Sh SEE ALSO
+.Xr sin 3 ,
+.Xr tan 3 ,
+.Xr asin 3 ,
+.Xr acos 3 ,
+.Xr atan 3 ,
+.Xr atan2 3 ,
+.Xr sinh 3 ,
+.Xr cosh 3 ,
+.Xr tanh 3 ,
+.Xr math 3
+.Sh STANDARDS
+The
+.Fn cos
+function conforms to
+.St -ansiC .