cacos

CACOS(3)		    complex math routines		     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);


DESCRIPTION
       The  cacos() function calculates the complex acos().  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)).

CONFORMING TO
       C99

SEE ALSO
       clog(3), ccos(3)



				  2002-07-28			     CACOS(3)