Prove that if a > b > 0 and c =a 2 b 2 , then
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Prove that if a > b > 0 and c =√a2 − b2, then a point P = (x, y) on the ellipsesatisfies PF = ePD with F = (c, 0), e = c/a, and vertical directrix D at x = a/e.
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+ b. = 1
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