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7) The currentI, in amperes, flowing through an AC (alternating current) circuit at timetisI(t)=220sin(45t4), wheret0. Find the period and the horizontal shift. 8) LetS(t)=18.56.5cos(6t)be the

7) The currentI, in amperes, flowing through an AC (alternating current) circuit at timetisI(t)=220sin(45t4), wheret0. Find the period and the horizontal shift.

8) LetS(t)=18.56.5cos(6t)be the sales function over1year whereSis sales in thousands of dollars andtis time in months, witht=1 corresponding to January. Which month has maximum sales? What is the maximum number of sales?

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