Signals and Systems

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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