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      1 /* mpc_cosh -- hyperbolic cosine of a complex number.
      2 
      3 Copyright (C)  2008, 2009, 2011 INRIA
      4 
      5 This file is part of GNU MPC.
      6 
      7 GNU MPC is free software; you can redistribute it and/or modify it under
      8 the terms of the GNU Lesser General Public License as published by the
      9 Free Software Foundation; either version 3 of the License, or (at your
     10 option) any later version.
     11 
     12 GNU MPC is distributed in the hope that it will be useful, but WITHOUT ANY
     13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
     14 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
     15 more details.
     16 
     17 You should have received a copy of the GNU Lesser General Public License
     18 along with this program. If not, see http://www.gnu.org/licenses/ .
     19 */
     20 
     21 #include "mpc-impl.h"
     22 
     23 int
     24 mpc_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