The function $f(x) = \cot x$ is discontinuous at every point of the set

  • A
    $\{x = 2n\pi ; n \in Z\}$
  • B
    $\{x = (2n+1) \frac{\pi}{2} ; n \in Z\}$
  • C
    $\{x = \frac{n\pi}{2} ; n \in Z\}$
  • D
    $\{x = n\pi ; n \in Z\}$

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