Question

find Laurent series expression of

(2+1)(2+3) in region

a- 1< |z| < 3

b- 0< |z+1| < 2

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Answer #1

we have to find the lennent senies expension os fiz) (211) (213) - 1 (2+3)-(211) (we can write abone expnession in this form)o< (6) | 레|<2 I S2 143) (4 ) 델에 호레 1몇 에델르 ㅢ

I use laurant series to solve this problem

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