Geogebra has a myriad of commands, which can be written in the fx input field. With these commands you can get GeoGebra to automatically calculate things, As in the past took a very long time and required, that you could insert and use some very large formulas.
An example
Take, for instance, having to find roots of a quadratic function with the rule f(x)=2x^2 3x 2, which requires, that you could insert into the formulas
and 
This is handled in GeoGebra by first writing the rule in the input box, and then type the command root[f]
2x^2 3x 2 Rod[f]
You can get a list of commands including.
Danish commands – Not all commands are translated into Danish
wiki.geogebra.org / da / Kategori:Commands