Question: Consider a sequence x[n] with descrete-time Fourier transform X(e j ). The sequence x[n] is real valued and causal, and Re{X(e j )} = 2

Consider a sequence x[n] with descrete-time Fourier transform X(ejω). The sequence x[n] is real valued and causal, and 

Re{X(ejω)} = 2 – 2α cos ω.

Determine Jm{X(ejω)}.

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