Which of the following cannot be the Fourier series expansion of a per – McqOptions

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1.	Which of the following cannot be the Fourier series expansion of a periodic signal?
A.	x(t) = 2 cos t + 3 cos 3t
B.	x(t) = 2 cos pt + 7 cos t
C.	x(t) = cos t + 0.5
D.	x(t) = 2 cos 1.5pt + sin 3.5 pt
Answer» D. x(t) = 2 cos 1.5pt + sin 3.5 pt

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