This applet allows you to graph 2-dimensional parametric curves.

We are assuming that a curve is
given by ** <x(u),y(u)>** with u running
between

The ** Constrained/Unconstrained
**button toggles between the two modes; it controls the scaling of
graph.
The current x and y coordinates of the mouse are displayed in the blue box
in the lower left corner of the applet.

Finally, as the graph is being drawn, an arrow will appear indicating the direction and the magnitude of the tangent vector at the current point.