1.

Let S and S′ be two foci of the ellipse x2a2+y2b2=1 . A circle is inscribed in the ellipse. If SS′ is the diameter of the circle, then the eccentricity e of the ellipse is

Answer»

Let S and S be two foci of the ellipse x2a2+y2b2=1 . A circle is inscribed in the ellipse. If SS is the diameter of the circle, then the eccentricity e of the ellipse is



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