1. What is the frequency of the sinusoidal graph?
2.Which equation represents the function on the graph?
1. The period is pi/ 2
Then....the frequency = 1 / period = 1 / [pi/ 2 ] = 2 / pi
2. This is the cosine graph which has 4 periods in 2pi
So.....the equation is
f(x) = cos (4x)
+509 
