$x=(2 n+1) \pi+\tan ^{-1}\left(\frac{3}{4}\right), n \in Z$

$x=2 n \pi+\tan ^{-1}\left(\frac{3}{4}\right), n \in Z$

$x=n \pi+\tan ^{-1}\left(\frac{3}{4}\right), n \in Z$

$x=n \pi \pm \tan ^{-1}\left(\frac{3}{4}\right), n \in Z$

5

8

10

12

$\sqrt{3}$

$-\sqrt{3}$

$\sqrt{5}$

$-\sqrt{5}$

$n \pi+\frac{\pi}{8}$

$n \pi \pm \frac{\pi}{8}$

$\frac{n \pi}{2} \pm \frac{\pi}{8}$

$\frac{n \pi}{2}+\frac{\pi}{8}$