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2. Consider a z-transform given by 22 -2 23 322 42 +1 a) Using power-series expansion techniques, determine the first three (closest to n 0 non-zero (b) Using power-series expansion techniques, determine the first three (closest to n-0) non-zero (c) Suppose the ROC of X(2) has the form k2 2 k Devise a power-series expansion based terms of r n assuming the ROC of X() has form 2l < ki. What is k? terms of r n assuming the ROC of X() has form 2 What is k2 method to determine n for 3 n3 HINT: Express Y(2) as a sum of two rational functions, one that coresponds to the right sided component(s) and the other that corresponds to the left-sided component(s) What are ki and k2 3 (a) Book problem 5.2-4 (b) Book problem 5.2-6

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