I tried to continue my homework but ran into another problem I couldn't do, literally can't continue now.
I have to graph $\displaystyle y=\frac 32 \sin2\left(x+ \frac{\pi}{4}\right)$
What do I do with $\sin 2$? Is it $\sin(2x + \pi/2)$, $\sin4(x/2 + \pi/8)$ or what?
Edit: I've got that the period of the function is $\pi$.