NAME

       catanh, catanhf, catanhl - complex arc hyperbolic tangent functions

SYNOPSIS

       #include <complex.h>

       double complex catanh(double complex z);
       float complex catanhf(float complex z);
       long double complex catanhl(long double complex z);

DESCRIPTION

       These  functions  shall  compute  the  complex  arc hyperbolic tangent of z, with branch cuts outside the
       interval [-1, +1] along the real axis.

RETURN VALUE

       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 [-ipi/2, +ipi/2] along the imaginary
       axis.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       ctanh() , the Base Definitions volume of IEEE Std 1003.1-2001, <complex.h>

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 .

IEEE/The Open Group                                   2003                                             CATANH(P)