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The coordinates of the foci of an ellips...

The coordinates of the foci of an ellipse are `(0,pm 4 ) ` and the equations of its directrices are ` y = pm 9 ` . Find the length of the latus rectum of the ellipse

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The correct Answer is:
`(y^(2))/(36)+(x^(2))/(20) = 1 ` or `5y^(2) + 9x^(2) = 180 `
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