1/* mpc_cosh -- hyperbolic cosine of a complex number.
2
3Copyright (C)  2008, 2009, 2011 INRIA
4
5This file is part of GNU MPC.
6
7GNU MPC is free software; you can redistribute it and/or modify it under
8the terms of the GNU Lesser General Public License as published by the
9Free Software Foundation; either version 3 of the License, or (at your
10option) any later version.
11
12GNU MPC is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
14FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
15more details.
16
17You should have received a copy of the GNU Lesser General Public License
18along with this program. If not, see http://www.gnu.org/licenses/ .
19*/
20
21#include "mpc-impl.h"
22
23int
24mpc_cosh (mpc_ptr rop, mpc_srcptr op, mpc_rnd_t rnd)
25{
26  /* cosh(op) = cos(i*op) */
27  mpc_t z;
28
29  /* z = i*op without copying significand */
30  mpc_realref (z)[0] = mpc_imagref (op)[0];
31  mpc_imagref (z)[0] = mpc_realref (op)[0];
32  MPFR_CHANGE_SIGN (mpc_realref (z));
33
34  return mpc_cos (rop, z, rnd);
35}
36