Getting started
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Using technology in maths lesson it is possible to introduce new tasks. One example for mathematical questions, that can be explored dynamically with different approaches, is the following:
Three intersection points with the horizontal axis of a rational function of degree 3 are given.
Construct the tangent at the midpoint of two zeros of the function f. What do you notice?
Using technology in maths classrooms enables much more interaction between students . Different mathematical representations can be used interactively by integrating CAS technology.

This can be demonstrated with the following film, which shows a possible solution of the given problem.

Why CAS
Technical guide
Here you can find some hints if you want to solve this problem by using technology. You have different kinds of hints to pick up ones which suit you best.
Rich instructions
We also try to provide you with different types of instructions that can be used. So there are paper based instructions, screencasts as well as HTML pages which show with the help of technology we can provide very rich instructions to students. On the left side there is a screencast with precise instructions and on the right side, there is an applet where students work [following the left side instructions].