If Xcas does not work correctly, clear your browser cache and reload
the page, with Firefox if possible.

A typical Xcas session will consist in entering commandlines that will appear in the history. Sometimes you will also edit an already entered command and reevaluate it. The screen is divided in

- A panel of buttons to load a session, see manuals and
configure. Once the history is non empty, additional buttons appear:
save or export session, a link that you can hit to e-mail or clone a session
(for example if your session crashed) or copy/paste, history/trash
and variables handling.
You can partially open an existing PC Xcas session from the File, Clone
menu of the Xcas program (or
`xcas --online filename.xws`). - The
**help area**where you will find short descriptions of commands you asked for. - The
**history**(empty when you start) divided into levels. You can move level up and down (button at the left). You can edit a level and reevaluate it (press Enter). You can move one level to the trash (press backspace button at the right), and empty the trash or recover levels in the trash (panel of buttons above). - A
**commandline**with buttons that will help you fill the commandline. You can show a**scientific or/and tool keyboard**(press the 123+ or tools button), then move the mouse near a button to have a short explanation on the corresponding command. You can enter the beginning of a command then press Tab or hit the ? button, this will show**completions**in the history. If you entered a valid Xcas command, a short online help will be displayed with examples, hit the corresponding buttons to copy one example, modify arguments and hit Enter to run the commandline. Additionnaly, in Firefox, right-click will show a menu of many Xcas commands. See also below for a few examples. - A
**console**, with messages from the CAS : parse errors or while running step by step commands like derivative. You can clear the console and control the height of the console. - a Graph3d button to show or hide controls for the 3d graph canvas.

- Algebra : You can expand an expression with
for example .
Conversely,
or
factors an expression (like )
over Q or Q[i].

`simplify(sin(3x)/sin(x)); gcd(x^4-1,x^3-1)` - Solve equations :
`solve(x^2-3*x+2=0); csolve(x^2=2*i); solve([x+y=1,x-y=3],[x,y])` - Calculus :
`f(x):=sin(x^2):; f(sqrt(pi)); f'(2); f'(y)`

int(1/(x^4-1)); int(1/(x^4+1)^4,x,0,+infinity)

limit(sin(x)/x,x=0); series(sin(x),x=0,5); - Linear algebra :
`A:=[[1,2],[3,4]]; inv(A); det(A-x*idn(A)); A[0,0]; rref(A); eigenvalues(A); eigenvectors(A);` - Plots :
`plot([sin(x),x-x^3/3!],x=-3..3,color=[red,blue])`

plotfunc(x^2-y^2,[x=-2..2,y=-2..2]); plane(z=0,color=cyan+filled);

Some features are disabled by default on mobile devices because Firefox mobile does not support them, like syntax highlighting during edition of existing levels. Note also that Chrome mobile (default browser on Android devices) is much slower than Firefox (about 5 times slower), it freezes a long time during the first evaluation. Moreover Chrome mobile does not support mathml natively, it requires Mathjax to display 2d formula, this requires net access and does not always succeed.

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