These functions are all specifically written for use in calculus. The
list below gives the names of the procedures we will be using, as well
as brief descriptions. Maple `help` screens are available for all
of these functions, so refer to them for further examples.

**VDiff**- Differentiates vector-valued functions.
**VPlot**- Plots vector-valued functions in two and three dimensions.
**VMag**- Computes the magnitude of a vector.
**ParamPlot**- Animates parametric curves in two dimensions.
**ParamPlot3D**- Animates parametric curves in three dimensions.
**Speed**- Computes the speed of a particle moving on a path defined
by a vector-valued function .

Tue Mar 25 09:42:50 EST 1997