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

Copyright (C) INRIA, 2008, 2009

This file is part of the MPC Library.

The MPC 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 MPC 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 MPC Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */

#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_RE (z)[0] = MPC_IM (op)[0];
  MPC_IM (z)[0] = MPC_RE (op)[0];
  MPFR_CHANGE_SIGN (MPC_RE (z));

  return mpc_cos (rop, z, rnd);
}