(Type "t" for .)

__Example__:*f*_{1}(*r*,)=*r*

** 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 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}(*r*,)=*r*
and
*f*_{2}(*r*,)=3+*r* cos )

*Up to 3 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.

__Plane__:*f*_{1}(*r*,)=*r* cos

__Hemisphere__:*f*_{1}(*r*,)=(25-*r*^{2})

__Paraboloid__:*f*_{1}(*r*,)=*r*^{2}-5

The graphs of the functions are color-coded, corresponding to the colors
of the labels marking the text input fields:
the graph of
*f*_{1}(*r*,)
is blue,
*f*_{2}(*r*,)
is red, and
*f*_{3}(*r*,)
is green.