1.\" Copyright (c) 1991 Regents of the University of California.
2.\" All rights reserved.
3.\"
4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
8.\" notice, this list of conditions and the following disclaimer.

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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)
27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30.\" SUCH DAMAGE.
31.\"
32.\" from: @(#)acosh.3 5.2 (Berkeley) 5/6/91
33.\" $Id: acosh.3,v 1.4 1993/10/29 22:57:20 jtc Exp $
34.\"
35.Dd May 6, 1991
36.Dt ACOSH 3
37.Os BSD 4.3
38.Sh NAME
39.Nm acosh
40.Nd inverse hyperbolic cosine function
41.Sh SYNOPSIS
42.Fd #include <math.h>
43.Ft double
44.Fn acosh "double x"
45.Sh DESCRIPTION
46The
47.Fn acosh
48function computes the inverse hyperbolic cosine
49of the real
50argument
51.Ar x .
52For a discussion of error due to roundoff, see
53.Xr math 3 .
54.Sh RETURN VALUES
55The
56.Fn acosh
57function
58returns the inverse hyperbolic cosine of
59.Ar x .
60On the
61.Tn VAX
62and
63.Tn Tahoe ,
64if the argument is less than one
65.Fn acosh
66sets the global variable

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