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 3.25 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                                                   CACOS(3)