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S and S^(1) foci of an ellipse. B is one...

S and `S^(1)` foci of an ellipse. B is one end of the minor axis. If I.`SBS^(1)` is a right angled isoscles triangle, then e =

A

`(1)/sqrt(2)`

B

`1/2`

C

`sqrt(3)/(2)`

D

`3/4`

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A
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