## GeoGebra 4.0 Sneak Peek 5: The Computer Algebra System

This is the fifth post of the GeoGebra 4.0 Sneak Peek Series.

One of the major enhancements of GeoGebra 4.0 is the integration of Computer Algebra System (CAS).  The GeoGebra CAS window can be viewed by clicking the View>CAS from the menu bar. The CAS toolbar includes the following tools as shown in the first figure:  Evaluate (exact evaluation), Numeric (numeric evaluation; e.g. sin(1)), Keep Input, Factor, Expand, Substitute, Solve, and Differential/ Integral.

You can enter  expressions/equations at the CAS window (see black texts below) and click the buttons at the toolbar to perform a command. The output of a command is shown in blue texts. Line 1, for example, used the Evaluate button to simplify 2x + 4x – 3y + 2y. » Read more

## Wikispaces and GeoGebra

An excellent presentation and tutorial by Dr. Linda Fahlberg about Wikispaces and GeoGebra.

## GeoGebra Advanced Tutorial 7 – Embedding Form Controls and JavaScript I

We have discussed before how to export a GeoGebra file into dynamic html. In all of our GeoGebra dynamic HTML documents, we have not allowed input from user except by dragging objects within the applet. In this tutorial, we are going to use HTML Form commands and basic Javascript to get input from the user using a text box and a command button.  In particular, we are going to display a dynamic HTML document with a Cartesian coordinate, a text box where the user will input the equation of the function that they want to graph, and a command button that will execute the graph command when clicked.  The final output of our tutorial can be viewed here and the html file (javascript1.html) can be downloaded  here.

If you have a background in HTML and Javascript, this tutorial will be quite easy; otherwise, read the  explanation about the HTML Form and Javascript commands below. » Read more

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