See section 12.12.6 for parametric equations in three-dimensional geometry.
The parameq command takes as argument a geometric object.
parameq returns a parametric equation of the object, in the
form x(t) + i*y(t). (Note that t must be a formal
variable, it may be necessary to purge it with purge(t).)
Input:
Output:
Input:
Output:
Input:
Output: