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    1. For a discrete-time signal x[n] with the DTFT where b is an arbitrary constant compute the DTFT V(Ω) of v[n] = x[n] - x[n-1].

    2. Compute the rectangular form of the four-point DFT of the following signal, which is zero for n<0 and n>=4.

    3. Compute the inverse DTFT of: X(ω)=sinΩ cosΩ

    4. Compute the inverse DTFT of X(ω)=Ω

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