The revenue received from the sale of electric fans is seasonal, with maximum revenue in the summer.
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The revenue received from the sale of electric fans is seasonal, with maximum revenue in the summer. Let the revenue (in dollars) received from the sale of fans be approximated by R(t) = 120 cos 2πt + 150, where t is time in years, measured from July 1.
(a) Find R′(t).
(b) Find R′(t) for August 1.
(d) Find R′(t) for June 1.
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Rt 120 cos 2t 150 a b c ...View the full answer
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