The height of a student above the ground on a circular Ferris wheel is given by the equation. H() = a sin (bt +c)+d %3D Where H(t) is the height in metres after t seconds. The diameter of the wheel is 14 metres and the student starts at the bottom of the Ferris wheel at t = 0 at a height of 3 metres above the ground. The value of a in the sinusoidal equation is

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