(a) Determine the autocorrelation of the random sequenceWhere {Ak} are constant amplitudes, {?k} are constant frequencies, and {øk} are mutually statistically independent and uniformly distributed random phases. The noise sequence ?(n) is white with variance ?2?.(b) Determine the power density spectrum of (n).

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> A, cos(w,n + pe) + w(n) x(n)