Bengt Ahlander* (Sweden), ba@ostrabo.uddevalla.se
Why use CAS with TI89 in mathematical education? Classrooms experiments.

New ways of teaching mathematics with CAS are coming now very strongly with the
help of a very good CAS tool such as the algebraic calculator TI-89.  You ought
to start thinking how to approach math with tools such as the TI-89.  My
thoughts will be  presented here.
Differential equation:
a) Movement from a string with friction.
b) A current from a circuit with resistance, condenser and coil coupled in
   series
Polynomial: What polynomial fits to given points?
Animation of the definition of the derivative.
How to solve linear equations. How to solve systems of equation.
How to treat upper sums and lower sums of a function. (Rieman integral)