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14 the sunset time varies sinusoidally with time the sunset...

Question: 14 the sunset time varies sinusoidally with time the sunset...

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14. The sunset time varies sinusoidally with time. The sunset time (5) in the town of Parry Sound can be modelled by the equation S -1.75os 2172) +18.4, where d is t he 365 day of the year. How long a period of time (in days) is the sun setting earlier than 7:00 p.m.? You may use technology to solve this problem. If you do use technology, include a neat labelled sketch with your solution.

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