o ook at the picture below. As a windmill's blade rotates, the height of its tip above ground is given by H(t) = 10 cos(30t - 10)° +20, 0≤t≤ 36 metres, where t is the time in seconds. a) Find the initial height of the blade's tip above the ground. b) When will the blade's tip reach the maximum height above the ground? Hence, calculate the maximum height of the blade's tip above the ground. c) When will the blade's tip reach the minimum height above the ground? Hence, calculate the minimum height of the blade's tip above the ground.

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