The server will give you the graph of two functions f and g, whose expressions will be hidden. You will then be presented a certain number of other graphs, corresponding to functions such as f(x)+g(x), f(-x)-g(x), f(x)+g(-x), etc (see the menu below). And you should locate the one which corresponds to one which will be precised in a question.To give the reply, you can simply click on the graph which you believe to be the good one.
Please take note that WIMS pages are interactively generated; they are not ordinary HTML files. They must be used interactively ONLINE. It is useless for you to gather them through a robot program.