is a singular point for a value t0 of t,
characterized by the simultaneous conditions
In this exercise, your goal is either to find a cusp in a given parametric
curve, or to determine the parametric curve having a given cusp.
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.