8. (TI) Pitt Lake is a freshwater lake. In a daily 24-hour period, the highest tide is traditionally at 11:00am reaching 5.8m, and the lowest tide is traditionally at 11:00 pm, reaching only 0.4m. (These are seasonal times and heights). a. Determine a cosine function that gives the tidal height of the lake, h, in terms of the hours after midnight, t. b. Create a sketch of this function (sketch first, label after)