8.2.65 A retarding force, symbolized by the dashpot in the figure to the right, slows the motion of the weighted spring so that the mass's position at time t is y = 4 et cost, t≥0. Find the average value of y over the interval 0 st≤2π. The average value for y is (Type an exact answer, using as needed.) 0 y Mass Dashpot