Interactive geometry systems also have a fun aspect - one can use animation to draw pretty pictures. Geometry Expressions is no different in this regard as the picture below shows.

Geometry Expressions can show, dynamically, the limit process involved in using the definition of the derivative of a function. The following examples illustrate this.

From the preceding, it should be clear that Geometry Expressions can draw curves defined symbolically and that dynamically changing the values of the parameters dynamically changes the entire curve. A few additional examples may illustrate this further.