\[1)\ y = tg\left( 2x + \frac{\pi}{6} \right)\]
\[2x + \frac{\pi}{6} \neq \frac{\pi}{2} + \pi n\]
\[2x \neq \frac{\pi}{3} + \pi n\]
\[x \neq \frac{\pi}{6} + \frac{\text{πn}}{2}.\]
\[2)\ y = \sqrt{\text{tg\ x}}\]
\[tg\ x \geq 0\]
\[\pi n \leq x < \frac{\pi}{2} + \pi n.\]