Mathematics

Problem

Which one of the following correctly describes the domain of the function

y=\tan x

? a)

x\neq n\pi,\;n\in\mathbb{Z}

x\neq n\dfrac{\pi}{2},\;n\in\mathbb{Z}

x\neq(2n+1)\dfrac{\pi}{2},\;n\in\mathbb{Z}

x\neq2n\pi,\;n\in\mathbb{Z}