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S3: Evaluate the following discrete-time convolution sums. (a) (10 pts) cos(En) u[n] * un 2] (b) (10 pts) (-1) * 2 u-n]

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S3: Evaluate the following discrete-time convolution sums. (a) (10 pts) cos(En) u[n] * un 2] (b) (10 pts) (-1)" * 2 u-n]

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