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Find the sum of the focal distance of an...

Find the sum of the focal distance of any point on the ellipse `9x^(2) +25y^(2) = 225 ` .

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The correct Answer is:
`:.overline(SP)+overline(S'P) = 5 - cosphi + 5 + 4 cos phi `
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The length of latus rectum of the ellipse 9x^(2) + 25y^(2) = 225 is _

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