The distance between the directrices of the \( \mathrm{P}^{16:} \) ...

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The distance between the directrices of the
\( \mathrm{P}^{16:} \)
W hyperbola \( x=8 \sec \theta, y=8 \tan \theta \) is
(1) \( 16 \sqrt{2} \)
(2) \( \sqrt{2} \)
(3) \( 8 \sqrt{2} \)
(4) \( 4 \sqrt{2} \)
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