Answer
$\pm\frac{\pi}{2},\pm\frac{3\pi}{2}$.
Work Step by Step
$y=tan(x)$ has vertical asymptotes when $x=k\pi+\frac{\pi}{2}$ (k is an integer). Within $[-2\pi,2\pi]$, we have $x=\pm\frac{\pi}{2},\pm\frac{3\pi}{2}$.
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