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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•cosb-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.


Sagot :