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If one extremity of the minor axis of th...

If one extremity of the minor axis of the ellipse `x^2/a^2+y^2/b^2=1` and the foci form an equilateral triangle, then its eccentricity, is

A

`1/2`

B

`1/sqrt2`

C

`1/3`

D

`sqrt3/2`

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A
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