Aditya's dog routinely eats Aditya's leftovers, which vary seasonally. As a result, his weight fluctuates throughout the year. The dog's weight W (t) (in kg) as a function of time t (in days) over the course of a year can be modeled by a sinusoidal expression of the form a cos(b t) + d. At t = 0, the start of the year, he is at his maximum weight of 9.1 kg. One-quarter of the year later, when t = 91.25. he is at his average weight of 8.2 kg. Find W (t). t should be in radians. W(t)

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