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.\"     from: @(#)asinh.3	6.4 (Berkeley) 5/6/91
.\" $FreeBSD$
.\"
.Dd June 9, 2013
.Dt ASINH 3
.Os
.Sh NAME
.Nm asinh ,
.Nm asinhf ,
.Nm asinhl
.Nd inverse hyperbolic sine functions
.Sh LIBRARY
.Lb libm
.Sh SYNOPSIS
.In math.h
.Ft double
.Fn asinh "double x"
.Ft float
.Fn asinhf "float x"
.Ft long double
.Fn asinhl "long double x"
.Sh DESCRIPTION
The
.Fn asinh ,
.Fn asinhf ,
and
.Fn asinhl
functions compute the inverse hyperbolic sine
of the real
argument
.Fa x .
For a discussion of error due to roundoff, see
.Xr math 3 .
.Sh RETURN VALUES
These functions
return the inverse hyperbolic sine of
.Fa x .
.Sh SEE ALSO
.Xr acosh 3 ,
.Xr atanh 3 ,
.Xr exp 3 ,
.Xr math 3
.Sh HISTORY
The
.Fn asinh ,
.Fn asinhf ,
and
.Fn asinhl
functions appeared in
.Bx 4.3 ,
.Fx 2.0 ,
and
.Fx 10.0 ,
respectively.