The depth D of water around a boat in a tidal bay, in feet, is given by +8 D(t)=5 sin (-) sin(-)+ where the time, t, is measured in hours since midnight. (a) Find the period of the tide. ANSWER: (b) What is the depth of the water when it is shallowest? (c) ANSWER: Find one time when the water is shallowest. ANSWER: (d) What is the depth of the water when it is deepest? ANSWER: (e) Find one time when the water is deepest.