Express the unilateral z-transforms of the following functions as rational functions.
(a) 0.9n
(b) 2(0.8)n + 3(1.1)n
(c) 3e–0.1n
(d) 3e–j0.1n
(e) 0.5 (ej0.5n + e–j0.5n)
(f) (–0.9)n
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