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Problem 4 [15 points] If input a[n] = 9+2 cos(n) +3 cos(n), and ↠[u]x 5y[n]+3y[n-1]+ y[n − 2] = 7x[n]+6x[n 1] x[n—2] a. [7 points] Compute the frequency response H(e). b. [8 points] Compute the output y[n].
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