(5) 2.2 A mass is attached to a spring and bobs up and down. The graph below shows the displacement function, where the values on the x-axis represent the time in seconds and the values on the y-axis the displacement in centimeters. 5 A 1 2 3 4 5 6 7 8 9 10 Q UA W N H O T NW Find the amplitude period and midline of the given graph and then find a formula for the function in terms of the cosine function. (6) [11]