Which of the following cannot be a Fourier series?
(a)
(b) 5 sin t + 3 sin 2t – 2 sin 3t + sin 4t
(c) sin t – 2cos 3t + 4 sin 4t + cos 4t
(d) sin t + 3 sin 2.7t – cos π t + 2 tan π t
(e)
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