__Example__:*x*_{1}(*t*)=cos *t*,
*y*_{1}(*t*)=sin *t*

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

*To see two parametric curves graphed simultaneously:*

** Enter** the second set of functions

** Click** (to its "on" state) the check box next
to these input fields.

** Click** the "Graph" button.

__Example__:*x*_{1}(*t*)=cos *t*,
*y*_{1}(*t*)=sin *t*;
*x*_{2}(*t*)=*t*-1,
*y*_{2}(*t*)=1-*t*

*Up to three curves 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 fields and click
the "Graph" button to refresh.

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

__Circle__:*x*_{1}(*t*)=cos *t*,
*y*_{1}(*t*)=sin *t*

__Polar Curve__:*x*_{1}(*t*)=cos 5*t* cos *t*,
*y*_{1}(*t*)=cos 5*t* sin *t*

__Cycloid__:*x*_{1}(*t*)=*t*-sin *t*,
*y*_{1}(*t*)=1-cos *t*