The Fourier series coefficient of time domain signal x (t) is X[k] = jδ[k-– jδ[k++ δ[k++ δ[k-3], the fundamental frequency of the signal is ω=2π. The signal is ___________
a) 2(cos 3πt – sin πt)
b) -2(cos 3πt – sin πt)
c) 2(cos 6πt – sin 2πt)
d) -2(cos 6πt – sin 2πt)
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