Let S, S' be the focii and B, B' be the ...

Let S, S' be the focii and B, B' be the minor axis of the ellipse `(x^(2))/(a^(2))+(y^(2))/(b^(2))=1` if `angle BSS'= theta` and eccentrictiy of the ellipse is e, then show that `e=cos theta`

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