6. Which of the following cannot be the Fourier series of a periodic function?
(a)f(x) = 2 cos x + 3 cos 3x (b) f(x) = 2 cos tx + 7 cos x
(c) f(x) = cos x + 0.5
(d) f(x) = 2 cos 1.511x + sin 3.51x
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sorry may I know book name and chapter
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