__Example__:*f*_{1}(*x*)=*e ^{x}*

** Click** the "Graph" button
(this button also refreshes the graph).

*To see two functions graphed simultaneously:*

** Enter** the second function

** Click** (to its "on" state) the check box next
to this input field.

** Click** the "Graph" button.

__Example__:*f*_{1}(*x*)=*e ^{x}*
and

*Up to five functions can be graphed simultaneously.*

** To remove** a function from the graph, click (to its "off" state)
the check box next to the associated text input field and click
the "Graph" button to refresh.

** To erase** the graph and all input fields, click the
"Clear" button.

__Comparison__:

*f*_{1}(*x*)=*e ^{-x2}*