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The function f(x)=cotx is discontinuous ...

The function `f(x)=cotx` is discontinuous on the set

A

`(x = n pi : n in Z)`

B

`(x=2 n pi, n in Z)`

C

{x = (2n+1) pi/2, n in Z}`

D

`{x = (npi)/2, n in Z}`

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