catanhl

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 double z);

       long double complex catanhl(long double complex z);


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*i,pi/2*i].

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

CONFORMING TO
       C99

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



				  2002-07-28			    CATANH(3)