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Suppose x(k) and y(k) are defined as follows x = [1, 5, 3, 4, 5, 1]; y = [3, 1, 4, 3];

(a) Find the linear cross-correlation matrix D(x). (b) Use D(x) to find the linear cross-correlation. Comment on your answer. (c) Find the normalized linear cross-correlation. (d) Find the circular cross-correlation matrix. (e) Use E(x) to find the circular cross-correlation. (f) Find the normalized circular cross-correlation, and comment on your answer.