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Signals and Spectra on Digital Communication related Questions and Answers


Question :   Which of the given signals are periodic?
1. x(t) = 4 cos(5πt)
2. x(t) = u(t) – 1/2
3. x(t) = 4u(t) + 2sin(3t)
4. x[n] = 2sin(3n)
Answer :   1 - x(t) = 4 cos(5πt)  

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