The monthly sales S (in hundreds of units) of skiing equipment at a sports store are approximated by It S 52.3 + 39.5 cos where t is the time (in months), with t = 1 corresponding to January. Determine the months in which sales exceed 7500 units. (Select all that apply.) O January O February O March O April O May O June O July O August O September □ October O November O December

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