If \( \tan \theta=\sqrt{n} \) for some non-square natural number \(...

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If \( \tan \theta=\sqrt{n} \) for some non-square natural number \( n \), then \( \sec 2 \theta \) is
\( \mathrm{P} \)
(A) a rational number
(B) an irrational number
W
(C) a positive number
(D) none of these
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