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