] A water wave in a lake has a frequency of 20 Hz (i.e., a wavelength or period of 0.05 seconds). Within each wave, the water level reaches a maximum height of 2.5 meters and a minimum height of 0.5 meters. Supposing that t = 0 corresponds to the water level at its minimum height, write down a trigonometric function that describes this water wave. Sketch the water wave over two periods. (Hint: Since the period = 0.05 seconds, which is very small, make the scale on the horizontal axis really big when you sketch the graph)