Which of the following cannot be the Fourier series expansion of a periodic sign

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Question
Which of the following cannot be the Fourier series expansion of a periodic signal?
Options
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

Correct Answer

x(t) = cos t + 0.5

Explanation

x(t) = cos t + 0.5

not satisfies the Dirichlet condition.

The integration of constant term is ?.

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Options
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