catanh, catanhf, catanhl − complex arc tangents hyperbolic

#include <complex.h>

double complex catanh(double complex z);

float complex catanhf(float complex double z);

long double complex catanhl(long double complex z);

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*i,pi/2*i].

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

C99

cabs(3), cimag(3), atanh(3)