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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