You need to surround this type of index with brackets. You also have to surround the numerator and denominator with brackets. The LiveMath Palette Most of the operations, functions and variables that you want can be found on the LiveMath Palette. You can hold the mouse over each button and see what the popup window says about it. Select the proposition by clicking on the rounded square.
Type Enter on the main keyboard before each example.
Select the proposition In the Compute menu, choose Simplify. Select the proposition. In the Compute menu, choose Collect . In the Compute menu, choose Factor . Go to the Graph menu, choose Graph 2D and then choose Curve OR on the LiveMath Palette, click on You can now change your function to anything you like and see immediate updates.