The difference of the focal distance of any point on \( \mathrm{P}^...

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The difference of the focal distance of any point on
\( \mathrm{P}^{16} \) the hyperbola \( 9 x^{2}-16 y^{2}=144 \), is

W
(1) 8
(2) 9
(3) 6
(4) 4
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