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
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Reference
[1] G. N. Berman, Problem Book in Mathematical Analysis, Moscow, Russia: Mir Publishers, 1957 p. 69.
Permanent Citation
"Projecting the Tangent Point of an Ellipse"
http://demonstrations.wolfram.com/ProjectingTheTangentPointOfAnEllipse/
Wolfram Demonstrations Project
Published: November 5 2012