linux man page for cacos

CACOS(3)						     Linux Programmer's Manual							  CACOS(3)

NAME
       cacos, cacosf, cacosl - complex arc cosine

SYNOPSIS
       #include <complex.h>

       double complex cacos(double complex z);
       float complex cacosf(float complex z);
       long double complex cacosl(long double complex z);

       Link with -lm.

DESCRIPTION
       The  cacos()  function  calculates  the	complex  arc cosine of z.  If y = cacos(z), then z = ccos(y).  The real part of y is chosen in the
       interval [0,pi].

       One has:

	   cacos(z) = -i clog(z + csqrt(z * z - 1))

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 3.27 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								  CACOS(3)