expand f(z)=z/(z-1)(2-z) in a laurent series valid 1<|z|<2
z0:0=2A−Bz^0: 0=2A-Bz0:0=2A−B
z1:1=−A+Bz^1: 1=-A+Bz1:1=−A+B
A=1,B=2A=1, B=2A=1,B=2
Geometric series
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