Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsZeros of a Polynomial or Rational Function and Its Derivativehttp://demonstrations.wolfram.com/ZerosOfAPolynomialOrRationalFunctionAndItsDerivative/]]>http://demonstrations.wolfram.com/ZerosOfAPolynomialOrRationalFunctionAndItsDerivative/