1/* Return cosine of complex double value.
2 Copyright (C) 1997-2016 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
19
20#include <complex.h>
21#include <fenv.h>
22#include <math.h>
23#include <math_private.h>
24
25
26__complex__ double
27__ccos (__complex__ double x)
28{
29 __complex__ double y;
30
31 __real__ y = -__imag__ x;
32 __imag__ y = __real__ x;
33
34 return __ccosh (y);
35}
36weak_alias (__ccos, ccos)
37#ifdef NO_LONG_DOUBLE
38strong_alias (__ccos, __ccosl)
39weak_alias (__ccos, ccosl)
40#endif
41