Revenue from Seasonal Merchandise The revenue received from the sale of air conditioners is seasonal, with the maximum revenue in summer. Let the revenue (in dollars) received from the sale of air conditioners be approximated by R(t) = 600 cos + 1000, where t is time in months, measured from July 1. (a) Find R'(1). (b) Find R'(1). (c) Find R'(t) for February. (d) Discuss whether the answers in parts (b) and (c) are rea- sonable for this model.

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