# How do you use the amplitude and period to graph  y=3sin8x?

One full wave for y = 3 sin 8x is from ( - $\frac{\pi}{8}$, 0) to ( +$\frac{\pi}{8}$, 0). through the origin (0, 0) , It touches y = - 3 and y = +3, in between, at ( - $\frac{\pi}{16}$, - 3) and ( +$\frac{\pi}{16}$, 3),
The amplitude is 3. The period of sin kx is 2$\frac{\pi}{k}$.
The wave repeats periodically in both -ve and +ve x-directions, with period $\frac{\pi}{4}$.