Q.

When is a complex exponential signal pure DC?

A. σ = 0 and Ω < 0
B. σ < 0 and Ω = 0
C. σ = 0 and Ω = 0
D. σ < 0 and Ω < 0
Answer» C. σ = 0 and Ω = 0
Explanation: a complex exponential signal is represented as x(t)= est
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