Standard equation of ellipse and auxiliary circleHard
Ellipse Eccentricity and Focal Distances
Let the product of the focal distances of the point 
on the ellipse 
, (a > b), be 
. Then the absolute difference of the eccentricities of two such ellipses is
on the ellipse , (a > b), be . Then the absolute difference of the eccentricities of two such ellipses isSELECT ONE OPTION
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