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Signals and Systems - Engineering

Q1:

If x1(t) = 2 sin pt + cos 4 pt and x2(t) = sin 5 pt + 3 sin 13 pt then

A x1, x2 both periodic

B x1 x2 both not periodic

C x1 periodic, x2 not periodic

D x1 is not periodic ; but x2 is periodic

ANS:A - x1, x2 both periodic

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