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7. Are the following signals periodic? If they are, find the fundamental periods. 10 (a) [ e- 141 -nl (b) _ cos 2ant 17=-00 n=1

7. Are the following signals periodic? If they are, find the fundamental periods. 10 (a) [ e- 141 -nl (b) _ cos 2ant 17=-00 n=1 8. Sketch the following signals: 00 (a) [e 'u(t)] E S(t -nT) (b) [a" u(n)] _ S(n - mN). 1=-00 m= -Do

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