사인 그래프와 직선

$\displaystyle 6 \sin \frac{\pi}{12} x = 3$에서 $\displaystyle \sin \frac{\pi}{12} x = \frac{1}{2}$ $\displaystyle \frac{\pi}{12} x = \frac{\pi}{6}$, $\displaystyle \frac{5}{6} \pi$ $x = 2$, $10$, $\therefore$$\displaystyle \mathrm{\overline{AB}} = 10 - 2 = 8$