Find the laurent series about the indicated singularity for the function e2z/(z-1)3 at z=1
f(z)=e2z(z−1)3f(z)=\frac {e^{2z}}{(z-1)^3}f(z)=(z−1)3e2z ,
Let the given complex function be analytic in an annulus r<∣z−1∣<Rr<|z−1|<Rr<∣z−1∣<R Then f(z)f(z)f(z) can be expanded into Laurent's series about z=1z=1z=1
Let z−1=uz-1 =uz−1=u , then z=u+1,z = u+1,z=u+1, Putting in f(z)f(z)f(z) and expanding
f(z)=1u3[1+2(u+1)+2(u+1)2+...]f(z)=\frac {1}{u^3}[1+2(u+1)+2(u+1)^2+...]f(z)=u31[1+2(u+1)+2(u+1)2+...]
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