CATANH(3) Linux Programmers Manual CATANH(3)
NAME
catanh, catanhf, catanhl  complex arc tangents hyperbolic
SYNOPSIS
#include
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))
CONFORMING TO
C99.
SEE ALSO
atanh(3), cabs(3), cimag(3), complex(7)
COLOPHON
This page is part of release 3.05 of the Linux manpages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/manpages/.
20071226 CATANH(3)
