Wolfram Demonstrations Project

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.

Reference

[1] G. N. Berman, Problem Book in Mathematical Analysis, Moscow, Russia: Mir Publishers, 1957 p. 69.

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Projecting the Tangent Point of an Ellipse