Question: Let x[n] denote a causal, complex-valued sequence with Fourier transform X(e j ) = X R (e j ) + j X I (e j

Let x[n] denote a causal, complex-valued sequence with Fourier transform 

X(ejω) = XR(ejω) + j XI(ejω).

If XR(ejω) = 1 + cos(ω) + sin (ω) – sin(2ω), determine XI(ejω).

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