KAlgebra

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KAlgebra is a calculator with symbolic and analysis features that lets you plot 2D and 3D functions as well as to easily calculate mathematical expressions.

It is part of the KDE Education Project.

First Steps with KAlgebra

Here are some tutorials:

               how to use the console tab.

               how to draw 3D Graph.

Another resource that can be useful to learn more about KAlgebra comes with KAlgebra: The Dictionary tab. It contains examples of every function supported by KAlgebra. Maybe the best way to learn how to do things with KAlgebra.

Documentation

KAlgebra Handbook

Wikipedia

Use of kalgebra in real word

Screenshots