/* mpc_cosh -- hyperbolic cosine of a complex number.

Copyright (C)  2008, 2009, 2011 INRIA

This file is part of GNU MPC.

GNU MPC 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 3 of the License, or (at your

option) any later version.

GNU MPC 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 this program. If not, see http://www.gnu.org/licenses/ .

*/

#include "mpc-impl.h"

int

mpc_cosh (mpc_ptr rop, mpc_srcptr op, mpc_rnd_t rnd)

{

  /* cosh(op) = cos(i*op) */

  mpc_t z;

  /* z = i*op without copying significand */

  mpc_realref (z)[0] = mpc_imagref (op)[0];

  mpc_imagref (z)[0] = mpc_realref (op)[0];

  MPFR_CHANGE_SIGN (mpc_realref (z));

  return mpc_cos (rop, z, rnd);

}