If the angle between the line joining the foci of an \( \mathrm{P} ...

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If the angle between the line joining the foci of an
\( \mathrm{P} \) ellipse to an extremity of a minor axis is \( 90^{\circ} \), then

W the eccentricity of the ellipse is:
(1) \( \frac{1}{8} \)
(2) \( \frac{1}{4} \)
(3) \( \frac{1}{\sqrt{2}} \)
(4) \( \frac{1}{\sqrt{3}} \)
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