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/* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
#include <math.h>
{
if(x >= 0.0)
{
const double epos
= exp(x
);
return (epos - 1.0/epos) / 2.0;
}
else
{
const double eneg
= exp(-x
);
return (1.0/eneg - eneg) / 2.0;
}
}