The general solution of $1 + \sin^2 x - 3 \sin x \cdot \cos x$, $\tan x \neq \frac{1}{2}$, is ......

Question

$n\pi - \frac{\pi}{4}, \, n \in \mathbb{Z}$

$n\pi + \frac{\pi}{4}, \, n \in \mathbb{Z}$

$2n\pi + \frac{\pi}{4}, \, n \in \mathbb{Z}$

$2n\pi - \frac{\pi}{4}, \, n \in \mathbb{Z}$

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