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My Opinion on Geogebra

GeoGebra is one of the most powerful and very useful for learning and teaching mathematics in schools, primary levels, secondary levels or even tertiary levels. It is very effective tools for learning and teaching mathematics. One reason which I figured out of why it is a commercial product/program is because of one of its features which enables us to upload our work (dynamic worksheet) to the web to be shared with others and this worksheet can be run using our own web browser.