Question: x ( z ) = 1 + 2 z - 1 1 - 2 z - 1 + z - 2 a . When the

x(z)=1+2z-11-2z-1+z-2
a. When the signal is causal
b. When the signal is anti causal
x ( z ) = 1 + 2 z - 1 1 - 2 z - 1 + z - 2 a .

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