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4. (25 Points) If I want the output to be, provide short answers to
a. (5 Points) Is the signal x () =cos(2x' ) periodic? If so, what is the period? If not, why not
b. (5 points) Is the signal x = cos (2arm), m=...,-1,0,1,2,... periodic? If so, what is the
period? If not, why not
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