4) The power spectral density function of n1(t) noise is given below. Randomly determine the values of a, fM, wo. After n;(t) noise goes through a series of processes, n2(t) = n1(t) cos (wot + 0) n1(t) sin (wot + 0) noise is obtained. O - (0,2n) has a uniform distribution. After determining the values of a, fM, wo randomly, find and draw the power spectral density function of n2(t). Explain your solution in detail. Sn, (f) a -fM fM