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In this desmos graph:

https://www.desmos.com/calculator/f607tsq5ux

I need to find max for the elliptical paths of rab and rcd so that I can determine the foci... I have researched on the web finding max of a function, but just cannot seem to get my head around it. Would greatly appreciate some help.

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Saw it that way myself... had some problem programmatically, don't recall what it was exactly, thx for taking a look.

Edited by Butch

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