Projecting the Tangent Point of an Ellipse
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Let the tangent from a point on the axis to the ellipse with semimajor axis and semiminor axis touch at the point in the first quadrant. (The equation of the ellipse is .) Then the value of remains the same as changes.
Contributed by: Izidor Hafner (November 2012)
Open content licensed under CC BY-NC-SA
 G. N. Berman, Problem Book in Mathematical Analysis, Moscow, Russia: Mir Publishers, 1957 p. 69.
"Projecting the Tangent Point of an Ellipse"
Wolfram Demonstrations Project
Published: November 5 2012