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Question 1: Sketch the following signals (without MATLAB): a) ?(?) = (? + 1)(? − 1)?(?...

Question 1: Sketch the following signals (without MATLAB):

a) ?(?) = (? + 1)(? − 1)?(? + 1) − (? + 1)??(?) − ?(? − 2)

b) ?[?] = ?[? + 1] − (? + 1)?[?] + ?[? + 1] − ?[? − 2]

c) ?(?) = (? + 1)(? − ?)?(? − ?) − (? + 1)(? − ? − 1)?(? − ? − 1) + (? + 1)(? − ? − 2)?(? − ? − 2)

m = 0

please make sure the answer is clear .

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