since cos(x) has it max at x=0, and you have a min there,
A(x) = 50(1-cos(x))
now just plug in x = 2pi/3
A ferris wheel has a diameter of 50 meters. If point A is at the lowest point of the ferris wheel, 0 meters. What is the height of point A if the wheel moves 2pi/3 radians clockwise? What is the equation?
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