a)Find the fourier transform of the signals. 2^n sin(pi*n /4) u[-n] b)  Consider a discrete-time LTI system with impulse response: h[n]= (1/2)^n u[n] Use Fourier transform to determine the response the input signals: x[n]= (n+1)(1/4)^n u[n] pls list the full step

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