Find the equation of the ellipse in the following cases:
(i) focus is (0, 1), directrix is x + y = 0 and e =
(ii) focus is (โ1, 1), directrix is x โ y + 3 = 0 and e =
(iii) focus is (โ2, 3), directrix is 2x + 3y + 4 = 0 and e =
(iv) focus is (1, 2), directrix is 3x + 4y โ 5 = 0 and e =
.