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Giac is a C++ library for computer algebra system distributed
under the GPL license, Xcas groups in the same graphical user interface
the CAS functionnalities of giac, a small spreadsheet and interactive
geometry. Both are under active development, the implemented math
functionnalities can today be used at undergraduate level. Programmation
can be done using the interpreted language available in several flavours
compatible with popular CAS (Maple, Mupad, TI89), or directly in C++
(either as a standalone program using the giac library or as dynamically
linked libraries to be loaded at runtime in an xcas session).
In xcas, you can display several views of a same object, e.g.
for a geometrical point, the point in a figure and it's coordinates
in the computation screen.
xcas outputs LATEX files, it is therefore easy to
insert figures or function graphs inside your own LATEX files.
giac documentation written by Bernard Parisse