As a wave passes by an offshore piling, the height of the water is modeled by the function 3 cos (+) 20 where h(t) is the height in feet above mean sea level at time t seconds. h(t) = 3 cos trough crest (a) Find the period of the wave. s (b) Find the wave height, that is, the vertical distance between the trough and the crest of the wave. ft