2.3-1/src/c/elementaryFunctions/asinh/dasinhs.c


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/*
 *  Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
 *  Copyright (C) 2007-2008 - 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
 *
 */

/*
//  METHOD
//     based on the formula  asinh(z) = -i asin(i z)
//     In real case asinh(z) = imag(asin(i z))
*/

#include "asinh.h"
#include "asin.h"

double	       dasinhs(double x) {
  return zimags(zasins(DoubleComplex(0.0, x)));
}