catanh man page on YellowDog

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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 ALSO
       atanh(3), cabs(3), cimag(3), complex(7)

				  2002-07-28			     CATANH(3)
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