20.6. Find the (unique) Laurent expansion of each of the following functions in each of its regions of analyticity: sinh z – z (d) 1 1 (a) (z – 2)(z – 3)* (b) z cos(z²). (c) 2²(1 – 2)" 22 – 4 z4 1 (e) (1 - 1 1 2)3* (f) 2 (h) (2² – 1)2 * 9. z – 1

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