Get in touch with CAS input in the [i]Algebra View[/i] by simplifying and expanding expressions with terms and variables.

[table][tr][td]1.[/td][td]Enter the expression [math]a+a[/math] into the [i]Input Bar[/i] and press [i]Enter[/i].[/td][/tr][tr][td][/td][td][b]Note:[/b] [i]GeoGebra[/i] will give you the output [math]2a[/math]. [/td][/tr][tr][td]2.[/td][td]Enter the expression [math]4x+3y-2x+y[/math] into the [i]Input Bar[/i] and press [i]Enter [/i]to simplify the expression.[/td][/tr][tr][td]3.[/td][td]Enter the expression [math]\frac{\frac{1}{x+y}-\frac{1}{x}}{y}[/math] into the [i]Input Bar [/i]and press [i]Enter [/i]to simplify the expression.[/td][/tr][tr][td]4.[/td][td]Enter the expression [math]\left(x+y\right)\left(x-y\right)\left(x-y\right)[/math] into the [i]Input Bar[/i] and press [i]Enter[/i].[/td][/tr][tr][td][/td][td][b]Note:[/b] [i]GeoGebra[/i] will give you the simplified output [math]\left(x+y\right)\left(x-y\right)^2[/math]. [/td][/tr][tr][td]5.[/td][td]Open the [i]More [/i]menu on the right side of your last input and select [i]Duplicate [/i]to copy the input into the next row.[/td][/tr][tr][td]6.[/td][td]Use the command [math]Expand\left(\left(x+y\right)\left(x-y\right)\left(x-y\right)\right)[/math] for the copied input to get the expanded expression. [/td][/tr][/table]