A cosine function is a reflection of its parent function over the x-axis. The amplitude of the function is 9, the vertical shift is 11 units down, and the period of the function is 12π7. The graph of the function does not show a phase shift.
What is the equation of the cosine function described?
Correctly complete the equation of the function.
f(x)= __cos( __ x ) __
9 , −20 , −11 , −9 , −2 , 2 , 11 , 20 , 7π/12 , 12π/7 , 7/6 , 6/7