__Example__:*f*_{1}(*s*,*t*)=*t*+4 cos *s*,
*g*_{1}(*s*,*t*)=4 sin *s*,
*h*_{1}(*s*,*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 surfaces 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}(*s*,*t*)=*t*+4 cos *s*,
*f*_{1}(*s*,*t*)=4 sin *s*, and
*f*_{1}(*s*,*t*)=*t*;
*f*_{2}(*s*,*t*)=5 cos *t* sin *s*,
*g*_{2}(*s*,*t*)=5 sin *t* sin *s*, and
*h*_{2}(*s*,*t*)=5 cos *s*

*Up to two surfaces 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.

__Plane__:*f*_{1}(*s*,*t*)=*s*,
*g*_{1}(*s*,*t*)=*t*,
*h*_{1}(*s*,*t*)=*s*+*t*

__Cylinder__:*f*_{1}(*s*,*t*)=5 cos *t*,
*g*_{1}(*s*,*t*)=5 sin *t*,
*h*_{1}(*s*,*t*)=*s*

__Slant Cylinder__:*f*_{1}(*s*,*t*)=*s*+5 cos *t*,
*g*_{1}(*s*,*t*)=5 sin *t*,
*h*_{1}(*s*,*t*)=*s*