!! used as default html header if there is none in the selected theme.
--- Introduction ---
Function draw is an exercise on the graphic recognition of functions of one real variable.
The server will give you the graph of a function f, whose expression will
be hidden. Then you are asked to draw the graph of another function such as
f(-x), 2f(x), f(x-1), etc (see the menu below), with the mouse.
You will have a score according to the precision of your drawing.