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An ellipse and a hyperbola are confocal ...

An ellipse and a hyperbola are confocal (have the same focus) and the conjugate axis of the hyperbola is equal to the minor axis of the ellipse. If `e_1a n de_2` are the eccentricities of the ellipse and the hyperbola, respectively, then prove that `1/(e1 2)+1/(e2 2)=2` .

A

1

B

2

C

3

D

4

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The correct Answer is:
B
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