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Find equation of the ellipse whose focus...

Find equation of the ellipse whose focus is (1,-1), then directrix the line x-y-3=0 and eccentricity `1/2` is

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` (x ^(2))/(a ^(2)) + (y ^(2))/(a ^(2) ( 1 - e ^(2)))=1;` Ellipse if `e lt 1;` Hyperbola if `e gt 1`
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