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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "CATANH" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" catanh 
+.SH NAME
+catanh, catanhf, catanhl \- complex arc hyperbolic tangent functions
+.SH SYNOPSIS
+.LP
+\fB#include <complex.h>
+.br
+.sp
+double complex catanh(double complex\fP \fIz\fP\fB);
+.br
+float complex catanhf(float complex\fP \fIz\fP\fB);
+.br
+long double complex catanhl(long double complex\fP \fIz\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+These functions shall compute the complex arc hyperbolic tangent of
+\fIz\fP, with branch cuts outside the interval
+[-1,\ +1] along the real axis.
+.SH RETURN VALUE
+.LP
+These functions shall return the complex arc hyperbolic tangent value,
+in the range of a strip mathematically unbounded along
+the real axis and in the interval [-\fIi\fPpi/2,\ +\fIi\fPpi/2] along
+the imaginary axis.
+.SH ERRORS
+.LP
+No errors are defined.
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIctanh\fP() , the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
+\fI<complex.h>\fP
+.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 .