Trigonometric Parametrization of an Ellipse
For an ellipse defined by a general quadratic equation in x and y, the trigonometric parametrization is obtained. The conic determined by this equation is graphed, and so is the parametrized version.
The graphs serve as validation of the parametrization - if the graph of the original quadratic and the graph of the parametric form coincide, then that is taken as evidence that the parametrization is correct.
Quadratic in x and y:
Student[Precalculus][ConicsTutor], geometry[ellipse], geometry[detail]
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