To get a better look at the graph, you can click on it.

Find a function of the form $f(x) = A \ sin(B \left [ x-C \right ] )+D$ whose graph is the sine wave shown above. The curve goes through the points $(-9,0)$ and $(1,0)$.
If needed, you can enter $\pi$=3.1416... as 'pi' in your answer.

$f(x) =$