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1. |
The Fourier series coefficient of time domain signal x (t) is X[k] = jδ[k-1] – jδ[k+1] + δ[k+3] + 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) |
Answer» D. -2(cos 6πt – sin 2πt) | |