Let x[n] be a causal stable sequence with z-transform X(z). The complex cepstrum is defined as the inverse transform of the logarithm of X(z); i.e.,
where the ROC of includes the unit circle. (Strictly speaking, taking the logarithm of a complex number requires some careful considerations. Furthermore, the logarithm of a valid z-transform may not be a valid z-transform. For now, we assume that this operation is valid.)
Determine the complex cepstrum for the sequence
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