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+.\" $NetBSD: catanh.3,v 1.3 2013/01/29 02:05:09 matt Exp $
+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
+.Dd January 29, 2013
+.Dt CATANH 3
+.Os
+.Sh NAME
+.Nm catanh ,
+.Nm catanhf ,
+.Nm catanhl
+.Nd complex arc hyperbolic tangent functions
+.Sh SYNOPSIS
+.In complex.h
+.Ft double complex
+.Fn catanh "double complex z"
+.Ft float complex
+.Fn catanhf "float complex z"
+.Ft long double complex
+.Fn catanhl "long double complex z"
+.Sh DESCRIPTION
+These functions compute the complex arc hyperbolic tangent of
+.Ar z ,
+with branch cuts outside the interval
+[\-1,\ +1] along the real axis.
+.Sh RETURN VALUES
+These functions return the complex arc hyperbolic tangent value,
+in the range of a strip mathematically unbounded along
+the real axis and in the interval [\-i pi/2,\ +i pi/2] along
+the imaginary axis.
+.Sh ERRORS
+No errors are defined.
+.Sh SEE ALSO
+.Xr ctanh 3 ,
+.St -p1003.1-2001
+.Aq Pa complex.h
+.Sh COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document.
+The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .