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The average daily temperature \(T\) in a city is modelled by the function \(T(m) = 15 - 12\cos(\frac{\pi}{6}m)\), where \(m\) is the month number (\(m=0\) is January).
Find the average yearly temperature (the midline).
Calculate the temperature in month \(m=4\) (May).
Find the minimum temperature and the month it occurs.
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