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+.\"	$OpenBSD: cosh.3,v 1.18 2025/06/07 10:33:06 schwarze Exp $
+.\" Copyright (c) 1989, 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. 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: @(#)cosh.3	5.1 (Berkeley) 5/2/91
+.\"
+.Dd $Mdocdate: June 7 2025 $
+.Dt COSH 3
+.Os
+.Sh NAME
+.Nm cosh ,
+.Nm coshf ,
+.Nm coshl
+.Nd hyperbolic cosine functions
+.Sh SYNOPSIS
+.Lb libm
+.In math.h
+.Ft double
+.Fn cosh "double x"
+.Ft float
+.Fn coshf "float x"
+.Ft long double
+.Fn coshl "long double x"
+.Sh DESCRIPTION
+The
+.Fn cosh
+function computes the hyperbolic cosine of
+.Fa x .
+The
+.Fn coshf
+function is a single precision version of
+.Fn cosh .
+The
+.Fn coshl
+function is an extended precision version of
+.Fn cosh .
+.Sh RETURN VALUES
+If the magnitude of x is too large,
+.Fn cosh "x" ,
+.Fn coshf "x"
+and
+.Fn coshl "x"
+return infinity and set the global variable
+.Va errno
+to
+.Er ERANGE .
+.Sh SEE ALSO
+.Xr acos 3 ,
+.Xr asin 3 ,
+.Xr atan 3 ,
+.Xr atan2 3 ,
+.Xr cos 3 ,
+.Xr sin 3 ,
+.Xr sinh 3 ,
+.Xr tan 3 ,
+.Xr tanh 3
+.Sh HISTORY
+The
+.Fn cosh
+function first appeared in
+.At v7 .