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If the chord, joining two points whose eccentric angles are `alpha and beta`, cuts the major axis ofthe ellipse `x^2/a^2 + y^2/b^2=1` at a distance c fromn the centre, then `tan alpha//2.tan beta//2` is equal to

A

1

B

e

C

`(c+a)/(c-a)`

D

`(c-a)/(c+a)`

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The correct Answer is:
A, B
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