CATANH(3) complex math routines 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 atanh(). 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 ALSOatanh(3), cabs(3), cimag(3), complex(7)
2002-07-28 CATANH(3)