The boxes below allow you to control the base function and the viewing
window. The point X0 can be dragged, allowing you to evaluate the
function and its derivatives at a point. Some intersting examples
are given.
It should be noted that the derivative is computation of the derivative
is not restricted to the domain of the original function.
GeoGebra is a GNUed software package for mathematics visualization.
The home for the applications is http://www.geogebra.at.