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

NAME         top

       cacos, cacosf, cacosl - complex arc cosine

SYNOPSIS         top

       #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         top

       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         top

       These functions first appeared in glibc in version 2.1.

CONFORMING TO         top

       C99.

SEE ALSO         top

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

COLOPHON         top

       This page is part of release 3.32 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)

HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface

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