An ellipse has a vertex at the origin and foci and , as shown in the figure. If the
Chapter 10, Problem 10.7.39(choose chapter or problem)
An ellipse has a vertex at the origin and foci and , as shown in the figure. If the focus at is fixed and is on the ellipse, show that approaches 4px as . (Thus, as , the ellipse takes on the shape of a parabola.)
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