Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsAverage Value of a Functionhttp://demonstrations.wolfram.com/AverageValueOfAFunction/]]>http://demonstrations.wolfram.com/AverageValueOfAFunction/The Tangent Line Problemhttp://demonstrations.wolfram.com/TheTangentLineProblem/]]>http://demonstrations.wolfram.com/TheTangentLineProblem/