text: /*
   *  Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
   *  Copyright (C) 2008-2008 - INRIA - Bruno JOFRET
   *
   *  This file must be used under the terms of the CeCILL.
   *  This source file is licensed as described in the file COPYING, which
   *  you should have received as part of this distribution.  The terms
   *  are also available at
   *  http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
   *
   */
  
  /*
  //         cosh(z) = 0.5 (exp(|z|) + exp(-|z|))
  //                 = 0.5 ( y + 1/y ) with y = exp(|z|)
  */
  
  #include <math.h>
  #include "cosh.h"
  #include "exp.h"
  #include "abs.h"
  
  double	       dcoshs(double x) {
    double y = dexps(dabss(x));
    return (0.5 * (y + 1.0/y));
  }
  