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Consider an LTI system defined by the difference equation

Consider an LTI system defined by the difference equation

y[n] = -2x[n] + 4x[n-1] - 2x[n-2]

 (a) Determine the impulse response of this system.

 (b) Determine the frequency response of this system. Express your answer in the form 

H(ejw) = A(ejw)e-jwnd

where A(ejw) is a real function of w. Explicitly specify A(ejw) and the delay nd of this system

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