Which of the following is / are correct, when \( n \in I \) ? \( \m...

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Which of the following is / are correct, when \( n \in I \) ?
\( \mathrm{P} \)
(1) \( \tan \left[(2 n+1) \frac{\pi}{2}\right] \) is not defined
W
(2) \( \sec \left[(2 n+1) \frac{\pi}{2}\right] \) is not defined
(3) \( \operatorname{cosec} n \pi \) is not defined
(4) \( \cot n \pi \) is not defined
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