.\" Copyright (c) 1985, 1991 Regents of the University of California.
.\" All rights reserved.
.\"
.\" %sccs.include.redist.roff%
.\"
.\"     @(#)asinh.3	6.4 (Berkeley) 05/06/91
.\"
.Dd 
.Dt ASINH 3
.Os BSD 4.3
.Sh NAME
.Nm asinh
.Nd inverse hyperbolic sine function
.Sh SYNOPSIS
.Fd #include <math.h>
.Ft double
.Fn asinh "double x"
.Sh DESCRIPTION
The
.Fn asinh
function computes the inverse hyperbolic sine
of the real
argument
.Ar x .
For a discussion of error due to roundoff, see
.Xr math 3 .
.Sh RETURN VALUES
The
.Fn asinh
function
returns the inverse hyperbolic sine of
.Ar x .
.Sh SEE ALSO
.Xr acosh 3 ,
.Xr atanh 3 ,
.Xr exp 3 ,
.Xr infnan 3
.Xr math 3 ,
.Sh HISTORY
The
.Fn asinh
function appeared in 
.Bx 4.3 .