A 2-column table with 5 rows. Column 1 is labeled x with entries negative StartFraction pi Over 2 EndFraction, 0, StartFraction pi Over 2 EndFraction, pi, StartFraction 3 pi Over 2 EndFraction. Column 2 is labeled y with entries 0, 6, 0, negative 6, 0. The function represented by the table has the form y = acos(bx). Which of the following statements are true? Check all that apply.

The function increases on the interval (π, 2π).
The graph is compressed horizontally by a factor of One-half
The frequency is StartFraction 1 Over 2 pi EndFraction
The maximum value of the function is 6.
The period is π.