1.

Let S(3,4) and S′(9,12) be two foci of an ellipse. If the coordinates of the foot of the perpendicular from focus S to a tangent of the ellipse is (1,−4), then the eccentricity of the ellipse is

Answer»

Let S(3,4) and S(9,12) be two foci of an ellipse. If the coordinates of the foot of the perpendicular from focus S to a tangent of the ellipse is (1,4), then the eccentricity of the ellipse is



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