code: public static double quadratic2( double g0 , double x0 , double g1  , double x1 ) {
  
  		return x0 + (g0/(g0-g1))*(x1-x0);
  	}
docs: <p>
  Quadratic interpolation using two derivatives.
  </p>
  
  @param g0 Derivative f'(x0)
  @param x0 First sample point
  @param g1 Derivative f'(x1)
  @param x1 Second sample point
  @return Interpolated point