If the line joining foci subtends an angle of \( 90^{\circ} \) at a...
If the line joining foci subtends an angle of \( 90^{\circ} \) at an
\( \mathrm{P}^{142} \) extremity of minor axis, then the eccentricity \( e \) is:
W
(1) \( \frac{1}{\sqrt{6}} \)
(4) \( \frac{1}{\sqrt{3}} \)
(3) \( \frac{1}{\sqrt{2}} \)
(4) \( \frac{1}{2 \sqrt{2}} \)
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