The depth of water at the end of a pier with tides through out the day. Today the tide occurs at 2:17 am with a depth of 9m. The low tide occurs at 8:31 am with a depth of 3.5m. If the tide edd and flow over time in a periodic manner, use cosine function a) to make a sketch a sketch of the graph over 24 hour period. b) find a trig equation that models the depth of the water t hours after midnight.