See Section 26.12.8 for parametric equations in 2D geometry.
The parameq command finds parameterizations for geometric objects.
For a curve, the parameter is t, for a surface, the parameters are u and v. These variables must be unassigned. If they have assignments, they can be unassigned with purge(t) and purge(u,v).
| parameq(line(point(0,1,0),point(1,2,3))) |
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| parameq(sphere(point(0,1,0),2)) |
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| normal(parameq(ellipse(point(-1,1,1),point(1,1,1),point(0,1,2)))) |
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