From:	gpk AT physics DOT att DOT com
Date:	Fri, 12 Mar 93 11:29:09 EST
Original-From:	physics!gpk (Greg Kochanski)
To:	djgpp AT sun DOT soe DOT clarkson DOT edu
Subject:	Correct tanh()

#include <math.h>

double tanh(double x)
{
  const double ebig = exp(x);
  const double esmall = 1.0/ebig;
  return (ebig - esmall) / (ebig + esmall);
}

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