Trigonometric Functions And Equations

$\left(0, \frac{\pi}{6}\right) \cup\left(\frac{5 \pi}{6}, 2 \pi\right)$

$\left(\frac{\pi}{8}, \frac{5 \pi}{6}\right)$

$\left(0, \frac{\pi}{8}\right) \cup\left(\frac{\pi}{6}, \frac{5 \pi}{6}\right)$

$\left(\frac{41 \pi}{48}, \pi\right)$