If $\sin 2x = 4 \cos x$, then $x = $
$n \frac{\pi}{2} \pm \frac{\pi}{4},\ n \in \mathbb{Z}$
No value
$n\pi + (-1)^n \frac{\pi}{4},\ n \in \mathbb{Z}$
$2n\pi \pm \frac{\pi}{2},\ n \in \mathbb{Z}$
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