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+.\" Copyright (c) 1985, 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:
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+.\" 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
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+.\"
+.\"     from: @(#)atanh.3	5.2 (Berkeley) 5/6/91
+.\" $FreeBSD: src/lib/msun/man/atanh.3,v 1.13 2005/01/28 21:14:16 ru Exp $
+.\"
+.Dd January 14, 2005
+.Dt ATANH 3
+.Os
+.Sh NAME
+.Nm atanh ,
+.Nm atanhf
+.Nd inverse hyperbolic tangent functions
+.Sh LIBRARY
+.Lb libm
+.Sh SYNOPSIS
+.In math.h
+.Ft double
+.Fn atanh "double x"
+.Ft float
+.Fn atanhf "float x"
+.Sh DESCRIPTION
+The
+.Fn atanh
+and the
+.Fn atanhf
+functions compute the inverse hyperbolic tangent
+of the real
+argument
+.Ar x .
+For a discussion of error due to roundoff, see
+.Xr math 3 .
+.Sh RETURN VALUES
+The
+.Fn atanh
+and the
+.Fn atanhf
+functions
+return the inverse hyperbolic tangent of
+.Ar x
+if successful.
+If the argument has absolute value 1, a divide-by-zero exception
+is raised and an infinity is returned.
+If
+.Ar |x|
+> 1, an invalid exception is raised and an \*(Na is returned.
+.Sh SEE ALSO
+.Xr acosh 3 ,
+.Xr asinh 3 ,
+.Xr exp 3 ,
+.Xr fenv 3 ,
+.Xr math 3
+.Sh HISTORY
+The
+.Fn atanh
+function appeared in
+.Bx 4.3 .