Problem 3 ܫܞ When expanding the triangular wave into a Fourier series of period 27, which of the following is correct: O(A)an = 0 for all n O(B)bn=0 for even n only O(C)an=0 for even n and b, = 0 for all n O(D)an = 0 for odd n and b, = 0 for all n O(E)an = 0 for all n and b = 0 for even n

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