can you set up this work and show me step by step. im so confused.... Tidal Wave: A tidal wave of height 50 feet and a period of 30 minutes is approaching a sea wall that is 12.5 feet above sea level (see figure). From a particular point on shore, the distance y from sea level to the top of the sea wall is given by y=25cos π/15 t with t in minutes. For approximately how many minutes is the top of the wave below the level of the sea wall?

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