catanf

CATAN(3)		    complex math routines		     CATAN(3)



NAME
       catan, catanf, catanl - complex arc tangents

SYNOPSIS
       #include <complex.h>

       double complex catan(double complex z);

       float complex catanf(float complex z);

       long double complex catanl(long double complex z);


DESCRIPTION
       The  catan() function calculates the complex atan().  If y = catan(z),
       then z = ctan(y).  The real part	 of  y	is  chosen  in	the  interval
       [-pi/2,pi/2].

       One has catan(z) = 1/2i clog((1+iz)/(1-iz)).

CONFORMING TO
       C99

SEE ALSO
       clog(3), ccos(3)



				  2002-07-28			     CATAN(3)