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.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" References consulted:
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.\" Linux libc source code
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.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
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.\" 386BSD man pages
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.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
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.\" Modified 2002-07-27 by Walter Harms
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.\" (walter.harms@informatik.uni-oldenburg.de)
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.\"
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.TH ATANH 3 2002-07-27 "" "Linux Programmer's Manual"
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.SH NAME
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atanh, atanhf, atanhl \- inverse hyperbolic tangent function
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.SH SYNOPSIS
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.nf
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.B #include <math.h>
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.sp
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.BI "double atanh(double " x );
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.br
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.BI "float atanhf(float " x );
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.br
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.BI "long double atanhl(long double " x );
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.sp
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.fi
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Link with \fI-lm\fP.
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.SH DESCRIPTION
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The
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.BR atanh ()
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function calculates the inverse hyperbolic tangent of
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\fIx\fP; that is the value whose hyperbolic tangent is \fIx\fP.
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If the absolute value of \fIx\fP is greater than 1.0,
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.BR atanh ()
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returns
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not-a-number (NaN) and \fIerrno\fP is set.
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.SH ERRORS
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.TP
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.B EDOM
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\fIx\fP is out of range.
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.SH "CONFORMING TO"
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SVr4, POSIX.1-2001, 4.3BSD, C89.
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The
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.I float
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and
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.I "long double"
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variants are C99 requirements.
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.SH "SEE ALSO"
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.BR acosh (3),
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.BR asinh (3),
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.BR catanh (3),
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.BR cosh (3),
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.BR sinh (3),
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.BR tanh (3)
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