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/* Return cosine of complex double value.

   Copyright (C) 1997 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#include <complex.h>

#include <math.h>

#include "math_private.h"

__complex__ double

__cacos (__complex__ double x)

{

  __complex__ double y;

  __complex__ double res;

  y = __casin (x);

  __real__ res = (double) M_PI_2 - __real__ y;

  __imag__ res = -__imag__ y;

  return res;

}

weak_alias (__cacos, cacos)

#ifdef NO_LONG_DOUBLE

strong_alias (__cacos, __cacosl)

weak_alias (__cacos, cacosl)

#endif