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The height \(H\) (in metres) of a rider on a Ferris wheel after \(t\) seconds is recorded. The wheel rotates at a constant speed. The maximum height is 25 metres and the minimum height is 1 metre. The wheel completes one full revolution every 20 seconds. At \(t=0\), the rider is at the bottom of the wheel.
Find a cosine function of the form \(H(t) = a\cos(b(t-c)) + d\) to model the rider's height.
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