Signals and Systems
A
sin 3pn B
cos 2pn C
sin 3pn D all
ANS:C - sin 3pn
In Discrete time signal irrational function cannot be periodic, frequency must be rational.
Hence only (c) is periodic.
sin 3pn = sin 3p(n + N) ⇒ for Periodic 3pN = 2Kp
 .
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