This notebook is an example of how LiveMath can help your students visualize difficult topics. They can change the function and the tangent  point and explore the mathematics in ways that in the recent past could not have been possible. This notebook is part of the Starter Library and when a License key is purchased, can be unlocked. All of the step by step calculations and mathematics can be revealed by double-clicking the collapsers (the .... __ seen under a propositon). You can double click the ... to reveal more information in any notebook. Click on the graph to stop the rotation, then drag with the mouse to explore from any perspective you choose.