A cosine function is a reflection of its parent function over the x-axis. The amplitude of the function is 2, the vertical shift is 11 units down, and the period of the function is . The graph of the function does not show a phase shift. What is the equation of the cosine function described? Drag a value into each box to correctly complete the equation of the function. -20 -11 f(x) -9 = cos( -2 2 9 11 x) 20 6π

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