!! used as default html header if there is none in the selected theme.
,or of the form
,where is the center of the ellipse and the ratio between the two axes of the ellipse is described by the ratio between and (how?).
This online exercise can either plot an ellipse and ask you to recognize its equation among a list to choose from, or give an equation and ask you to recognize the plotted ellipse among a list to choose from.
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.