The variation in the depth of water in a rock pool can be modelled using the function

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The variation in the depth of water in a rock pool can be modelled using the function y = sin (30t)°, where t is the time in hours and 0 ≤ t ≤ 6.

a. Sketch the function for the given interval.

b. If t = 0 represents midday, during what times will the rock pool be at least half full?

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