mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-15 10:17:20 +00:00
89 lines
2.6 KiB
Groff
89 lines
2.6 KiB
Groff
.\" Copyright (c) 1991 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: @(#)acosh.3 5.2 (Berkeley) 5/6/91
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd May 6, 1991
|
|
.Dt ACOSH 3
|
|
.Os BSD 4.3
|
|
.Sh NAME
|
|
.Nm acosh ,
|
|
.Nm acoshf
|
|
.Nd inverse hyperbolic cosine functions
|
|
.Sh SYNOPSIS
|
|
.Fd #include <math.h>
|
|
.Ft double
|
|
.Fn acosh "double x"
|
|
.Ft float
|
|
.Fn acoshf "float x"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn acosh
|
|
and the
|
|
.Fn acoshf
|
|
functions compute 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
|
|
and the
|
|
.Fn acoshf
|
|
functions
|
|
return 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 math 3
|
|
.Sh HISTORY
|
|
The
|
|
.Fn acosh
|
|
function appeared in
|
|
.Bx 4.3 .
|