\( \sqrt{2} \cos x = 1 \)
\( \cos x = \frac{1}{\sqrt{2}} = \frac{\sqrt{2}}{2} \)
\( x = \pm \frac{\pi}{4} + 2\pi k, k \in \mathbb{Z} \)
\( 3\text{tg}2x = -\sqrt{3} \)
\( \text{tg}2x = -\frac{\sqrt{3}}{3} \)
\( 2x = -\frac{\pi}{6} + \pi n, n \in \mathbb{Z} \)
\( x = -\frac{\pi}{12} + \frac{\pi n}{2}, n \in \mathbb{Z} \)
Ответ: 1) \( x = \pm \frac{\pi}{4} + 2\pi k, k \in \mathbb{Z} \); 2) \( x = -\frac{\pi}{12} + \frac{\pi n}{2}, n \in \mathbb{Z} \).