Check the periodicity for each of the following signals for 0 ? n ? ?. If they are periodic, what is the period? 1. cos(2?n + ?) 2. (.1)?cos(5?n + ?/2) 3. u(n) 4. u(n) + 1 5. ?(n) + u(n) 6. cos(?2?n) 7. u(n) + cos(2?n + ?) 8. cos(2?n + ?) + ?(n - 1) 9. 2cos(2n - ?)
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