__Example__:*f*_{1}(*t*)=3cos 3*t*,
*g*_{1}(*t*)=3sin 3*t*,
*h*_{1}(*t*)=*t*

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

** Rotate** the graph by
clicking and dragging the mouse on the graph.

*To see two curves graphed simultaneously:*

** Enter** the second set of functions

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

** Click** the "Graph" button.

__Example__:*f*_{1}(*t*)=3cos 3*t*,
*f*_{1}(*t*)=3sin 3*t*, and
*f*_{1}(*t*)=*t*;
*f*_{2}(*t*)=1+3*t*,
*g*_{2}(*t*)=2-2*t*, and
*h*_{2}(*t*)=3+*t*

*Up to three curves can be graphed simultaneously.*

** To remove** a curve 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.

__Helix__:*f*_{1}(*t*)=3cos 3*t*,
*g*_{1}(*t*)=3sin 3*t*,
*h*_{1}(*t*)=*t*

__Wavy Circle__:*f*_{1}(*t*)=3cos *t*,
*g*_{1}(*t*)=3sin *t*,
*h*_{1}(*t*)=sin 3*t*

__Ellipses__:*f*_{1}(*t*)=3cos *t*,
*g*_{1}(*t*)=2+5sin *t*,
*h*_{1}(*t*)=0;
*f*_{2}(*t*)=0,
*g*_{2}(*t*)=-2+5sin *t*,
*h*_{2}(*t*)=3cos *t*