Which of the following could not be the fourier series


Question: 1. Find a trigonometric Fourier series representation of the function s(t) = cos π t in the interval 0 < t=""><>

2. Which of the following could not be the Fourier series expansion of a periodic signal?

s1(t) = 2cos t + 3cos 3t

s2(t) = 2cos 0.5t + 3cos 3.5t

s3(t) = 2cos 0.25t + 3cos 0.00054t

s4(t) = 2cos Πt + 3cos 2t

s4(t) = 2cos Πt + 3cos 2Πt

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Engineering Mathematics: Which of the following could not be the fourier series
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