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Revision 1.1.1.1 (vendor branch), Sun Mar 21 09:45:37 1993 UTC (31 years ago) by cgd
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initial import of 386bsd-0.1 sources

.\" Copyright (c) 1991 Regents of the University of California.
.\" All rights reserved.
.\"
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.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
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.\"    may be used to endorse or promote products derived from this software
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.\"     @(#)acosh.3	5.2 (Berkeley) 5/6/91
.\"
.Dd May 6, 1991
.Dt ACOSH 3
.Os BSD 4.3
.Sh NAME
.Nm acosh
.Nd inverse hyperbolic cosine function
.Sh SYNOPSIS
.Fd #include <math.h>
.Ft double
.Fn acosh "double x"
.Sh DESCRIPTION
The
.Fn acosh
function computes the inverse hyperbolic cosine
of the real
argument
.Ar x .
For a discussion of error due to roundoff, see
.Xr math 3 .
.Sh RETURN VALUES
The
.Fn acosh
function
returns the inverse hyperbolic cosine of
.Ar x .
On the
.Tn VAX
and
.Tn Tahoe ,
if the argument is less than one
.Fn acosh
sets the global variable
.Va errno
to
.Er EDOM
and
causes a reserved operand fault.
.Sh SEE ALSO
.Xr asinh 3 ,
.Xr atanh 3 ,
.Xr exp 3 ,
.Xr infnan 3
.Xr math 3 ,
.Sh HISTORY
The
.Fn acosh
function appeared in 
.Bx 4.3 .