FOM: conics

[Neil Tennant]

Can any fomer tell me who first proved that a tangent to an ellipse makes
equal angles with the lines drawn from the foci to the point of contact of
the tangent with the ellipsis? And where is the most *elementary* proof to
be found?

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Neil W. Tennant
Professor of Philosophy and Adjunct Professor of Cognitive Science
230 North Oval
The Ohio State University