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Find the distance between the directrices of the ellipse `(x^2)/(36)+(y^2)/(20)=1.`

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`x^2/36+y^2/20=1`
`a^2=36,b^2=20`
`a=pm6,b=pm2sqrt5`
`e=sqrt(36-20)/6=2/3`
`e=2/3`
Distance between directrics=6/(2/3)=9.
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