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electronics and communication engineering communication systems
1. Which of the following cannot be the Fourier series expansion of a periodic signal?
(A): x(t) = 2 cos 1.5p t + sin 3.5 p t
(B): x(t) = 2 cos p t + 7 cos t
(C): x(t) = 2 cos t + 3 cos 3t
(D): x(t) = cos t + 0.5
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By: guest on 01 Jun 2017 11.48 pm
x(t) = cos t + 0.5 not satisfies the Dirichlet condition. The integration of constant term is ∞.
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