catanhl man page on Scientific

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```CATANH(3)		   Linux Programmer's Manual		     CATANH(3)

NAME
catanh, catanhf, catanhl - complex arc tangents hyperbolic

SYNOPSIS
#include <complex.h>

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

Link with -lm.

DESCRIPTION
The  catanh() function calculates the complex arc hyperbolic tangent of
z.  If y = catanh(z), then z = ctanh(y).	 The imaginary part  of	 y  is
chosen in the interval [-pi/2,pi/2].

One has:

catanh(z) = 0.5 * clog((1 + z) / (1 - z))

VERSIONS
These functions first appeared in glibc in version 2.1.

CONFORMING TO
C99.

SEE ALSO
atanh(3), cabs(3), cimag(3), complex(7)

COLOPHON
This  page  is  part of release 3.22 of the Linux man-pages project.  A
description of the project, and information about reporting  bugs,  can
be found at http://www.kernel.org/doc/man-pages/.

2008-08-11			     CATANH(3)
```
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