1.\" $OpenBSD: asinh.3,v 1.10 2003/06/02 20:18:41 millert Exp $ 2.\" Copyright (c) 1985, 1991 Regents of the University of California. 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 3. Neither the name of the University nor the names of its contributors 14.\" may be used to endorse or promote products derived from this software 15.\" without specific prior written permission. 16.\" 17.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27.\" SUCH DAMAGE. 28.\" 29.\" from: @(#)asinh.3 6.4 (Berkeley) 5/6/91 30.\" 31.Dd May 6, 1991 32.Dt ASINH 3 33.Os 34.Sh NAME 35.Nm asinh , 36.Nm asinhf 37.Nd inverse hyperbolic sine functions 38.Sh SYNOPSIS 39.Fd #include <math.h> 40.Ft double 41.Fn asinh "double x" 42.Ft float 43.Fn asinhf "float x" 44.Sh DESCRIPTION 45The 46.Fn asinh 47function computes the inverse hyperbolic sine 48of the real argument. 49The 50.Fn asinhf 51function is a single precision version of 52.Fn asinh . 53.Sh RETURN VALUES 54The 55.Fn asinh 56and 57.Fn asinhf 58functions return the inverse hyperbolic sine of 59.Ar x . 60.Sh SEE ALSO 61.Xr acosh 3 , 62.Xr atanh 3 , 63.Xr exp 3 , 64.Xr infnan 3 , 65.Xr math 3 66.Sh HISTORY 67The 68.Fn asinh 69function appeared in 70.Bx 4.3 . 71