The projected monthly sales S (in thousands of units) of lawn mowers are modeled by S =

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The projected monthly sales S (in thousands of units) of lawn mowers are modeled by S = 74 + 3t - 40 cos πt / 6 where t is the time (in months), with t = 1 corresponding to January.
(a) Graph the sales function over 1 year.
(b) What are the projected sales for June?
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