\[y = tg\ x.\]
\[1)\ \left\lbrack \frac{\pi}{4};\ \frac{\pi}{3} \right\rbrack:\]
\[\frac{\pi}{4} \leq x \leq \frac{\pi}{3}\]
\[- \frac{\pi}{2} < x < \frac{\pi}{2}.\]
\[Ответ:\ \ да.\]
\[2)\ \left( \frac{\pi}{2};\ \pi \right):\]
\[\frac{\pi}{2} < x < \pi\]
\[\frac{\pi}{2} < x < \frac{3\pi}{2}.\]
\[Ответ:\ \ да.\]
\[3)\ \left( - \frac{\pi}{2};\ \frac{\pi}{8} \right):\]
\[- \frac{\pi}{2} < x < \frac{\pi}{8}\]
\[- \frac{\pi}{2} < x < \frac{\pi}{2}.\]
\[Ответ:\ \ да.\]
\[4)\ \lbrack 2;\ 3\rbrack:\]
\[2 \leq x \leq 3\]
\[\frac{\pi}{2} < x < \frac{3\pi}{2}.\]
\[Ответ:\ \ да.\]