The function \( f(x)=\cot x \) is discontinuous on the set (A) \( \...

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The function \( f(x)=\cot x \) is discontinuous on the set
(A) \( \{x=n \pi: n \in \mathbf{Z}\} \)
(B) \( \{x=2 n \pi: n \in \mathbf{Z}\} \)
\( \mathrm{P} \)
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(C) \( \left\{x=(2 n+1) \frac{\pi}{2} ; n \in \mathbf{Z}\right\} \)
(iv) \( \left\{x=\frac{n \pi}{2} ; n \in \mathbf{Z}\right\} \)
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