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CACOS(P)		   POSIX Programmer's Manual		      CACOS(P)

NAME
       cacos, cacosf, cacosl - complex arc cosine functions

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
       These  functions shall compute the complex arc cosine of z, with branch
       cuts outside the interval [-1, +1] along the real axis.

RETURN VALUE
       These functions shall return the complex arc cosine value, in the range
       of a strip mathematically unbounded along the imaginary axis and in the
       interval [0, pi] along the real axis.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       ccos() , the Base Definitions  volume  of  IEEE Std 1003.1-2001,	 <com‐
       plex.h>

COPYRIGHT
       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003	by  the	 Institute  of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			      CACOS(P)
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