Manual of CTANH(3) (v2.18)

complex math routines

NAME

ctanh, ctanhf, ctanhl - complex hyperbolic tangent

#include <complex.h>

double complex ctanh(double complex z);
float complex ctanhf(float complex z);
long double complex ctanhl(long double complex z);

Link with -lm.

The complex hyperbolic tangent function tanh(z) is defined mathematically as sinh(z) / cosh(z).

C99