suse man page for catan

CATAN(3)						     Linux Programmer's Manual							  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);

       Link with -lm.

DESCRIPTION
       The  catan()  function  calculates  the	complex arc tangent of z.  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))

VERSIONS
       These functions first appeared in glibc in version 2.1.

CONFORMING TO
       C99.

SEE ALSO
       ccos(3), clog(3), complex(7)

COLOPHON
       This page is part of release 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

								    2008-08-11								  CATAN(3)