Expressions are created by using the keys on the smartphone as well as selecting functions and constants from the menu to build an expression in the Expression Text Box. The menu also has a selection for "Shortcuts" which will help make typing expressions easier.

When finished, users simply select the "Enter" key and the expression will be evaluated. Previously created functions may be selected and edited from the Expression List.

There are two major types of expressions, Graph expressions and Arithmetic expressions.

Graph Expressions
When a graph expression is evaluated, a plot of the graph will be shown. Enter expressions directly from the phone keyboard or select functions from the menu to select from a shortcut list. For example:
y=sin(x)
y=x^2
y=(x^2-2x+4)/(x-2)

Arithmetic Expressions
When arithmetic expressions are evaluated, the results are put into the Expression List. The following are examples of arithmetic expressions:
45+2+9
SQRT(3^2+4^2) (Extra points if you know what this represents!)

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