<s>
Xcas	B-Language
is	O
a	O
user	O
interface	O
to	O
Giac	O
,	O
which	O
is	O
an	O
open	B-Application
source	I-Application
computer	B-General_Concept
algebra	I-General_Concept
system	I-General_Concept
(	O
CAS	O
)	O
for	O
Windows	B-Application
,	O
macOS	B-Application
and	O
Linux	B-Application
among	O
many	O
other	O
platforms	O
.	O
</s>
<s>
Xcas	B-Language
is	O
written	O
in	O
C++	B-Language
.	O
</s>
<s>
Giac	O
can	O
be	O
used	O
directly	O
inside	O
software	O
written	O
in	O
C++	B-Language
.	O
</s>
<s>
Xcas	B-Language
has	O
a	O
compatibility	O
modes	O
with	O
many	O
popular	O
algebra	O
systems	O
like	O
WolframAlpha	B-Application
,	O
Mathematica	B-Application
,	O
Maple	B-Language
,	O
or	O
MuPAD	B-Language
.	O
</s>
<s>
Users	O
can	O
use	O
Giac/Xcas	O
to	O
develop	O
formal	O
algorithms	O
or	O
use	O
it	O
in	O
other	O
software	O
.	O
</s>
<s>
Giac	O
is	O
used	O
in	O
SageMath	B-Application
for	O
calculus	O
operations	O
.	O
</s>
<s>
Among	O
other	O
things	O
,	O
Xcas	B-Language
can	O
solve	O
equations	O
(	O
Figure	O
3	O
)	O
and	O
differential	O
equations	O
(	O
Figure	O
4	O
)	O
and	O
draw	O
graphs	B-Application
.	O
</s>
<s>
There	O
is	O
a	O
forum	O
for	O
questions	O
about	O
Xcas	B-Language
.	O
</s>
<s>
CmathOOoCAS	O
,	O
an	O
OpenOffice.org	B-Application
plugin	O
which	O
allows	O
formal	O
calculation	O
in	O
Calc	O
spreadsheet	B-Application
and	O
Writer	O
word	O
processing	O
,	O
uses	O
Giac	O
to	O
perform	O
calculations	O
.	O
</s>
<s>
Here	O
is	O
a	O
brief	O
overview	O
of	O
what	O
Xcas	B-Language
is	O
able	O
to	O
do	O
:	O
</s>
<s>
Xcas	B-Language
works	O
also	O
as	O
a	O
spreadsheet	B-Application
;	O
</s>
<s>
computer	B-Algorithm
algebra	I-Algorithm
;	O
</s>
<s>
spreadsheet	B-Application
;	O
</s>
<s>
draw	O
graphs	B-Application
;	O
</s>
<s>
calculate	O
differential	O
(	O
or	O
derivative	B-Algorithm
)	O
of	O
functions	O
(	O
Figure	O
2	O
)	O
;	O
</s>
<s>
calculate	O
antiderivative	B-Algorithm
of	O
functions	O
(	O
Figure	O
2	O
)	O
;	O
</s>
<s>
Example	O
Xcas	B-Language
commands	O
:	O
</s>
<s>
Xcas	B-Language
and	O
Giac	O
are	O
open-source	B-Application
projects	O
developed	O
and	O
written	O
by	O
and	O
Renée	O
De	O
Graeve	O
at	O
the	O
former	O
Joseph	O
Fourier	O
University	O
of	O
Grenoble	O
(	O
now	O
the	O
Grenoble	O
Alpes	O
University	O
)	O
,	O
France	O
since	O
2000	O
.	O
</s>
<s>
Xcas	B-Language
and	O
Giac	O
are	O
based	O
on	O
experiences	O
gained	O
with	O
Mr.	O
Parisse	O
's	O
former	O
project	O
Erable	B-Application
.	O
</s>
<s>
The	O
system	O
was	O
also	O
chosen	O
by	O
Hewlett-Packard	O
as	O
the	O
CAS	O
for	O
their	O
HP	B-Device
Prime	I-Device
calculator	O
,	O
which	O
utilizes	O
the	O
Giac/Xcas	O
1.5.0	O
engine	O
under	O
a	O
dual-license	O
scheme	O
.	O
</s>
<s>
In	O
2013	O
the	O
mathematical	O
software	O
Xcas	B-Language
was	O
also	O
integrated	O
into	O
GeoGebra	B-Language
's	O
CAS	O
view	O
.	O
</s>
<s>
Since	O
2015	O
is	O
Xcas	B-Language
used	O
in	O
the	O
French	O
education	O
system	O
.	O
</s>
<s>
Xcas	B-Language
is	O
also	O
used	O
in	O
German	O
universities	O
,	O
and	O
also	O
in	O
Spain	O
and	O
Mexico	O
and	O
the	O
University	O
of	O
North	O
Carolina	O
Wilmington	O
as	O
well	O
as	O
the	O
University	O
of	O
New	O
Mexico	O
.	O
</s>
<s>
Xcas	B-Language
is	O
especially	O
used	O
for	O
learning	O
algebra	O
.	O
</s>
<s>
There	O
is	O
a	O
port	O
of	O
Giac/Xcas	O
for	O
Casio	B-Device
graphing	I-Device
calculators	I-Device
:	O
fx-CG10	O
,	O
fx-CG20	O
,	O
fx-CG50	O
,	O
fx-9750GIII	O
,	O
fx-9860GIII	O
,	O
called	O
.	O
</s>
<s>
These	O
calculators	O
do	O
not	O
have	O
their	O
own	O
computer	B-General_Concept
algebra	I-General_Concept
system	I-General_Concept
.	O
</s>
