Consider a sequence x[n] with descrete-time Fourier transform X(e j ). The sequence x[n] is real valued

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

Re{X(e^jω)} = 2 – 2α cos ω.

Determine Jm{X(e^jω)}.

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