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Let `P` be any point on a directrix of an ellipse of eccentricity `e ,S` be the corresponding focus, and `C` the center of the ellipse. The line `P C` meets the ellipse at `Adot` The angle between `P S` and tangent a `A` is `alpha` . Then `alpha` is equal to `tan^(-1)e` (b) `pi/2` `tan^(-1)(1-e^2)` (d) none of these

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