rider gets on a Ferris wheel at the lowest point of rotation and completes one full revolution in 3 minutes. The Ferris wheel has a diameter of 26 m and a rider gets on the wheel 2m above ground.  the height of a rider above the ground, y, in metres can be modelled by the sinusoidao function y=asin(by-1.57)+d  statw the values of a and d

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