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If $C$ is a circle $\mid z \mid=4$ and $f(z)=\frac{z^2}{(z^2-3z+2)^2}$, then $\underset{C}{\oint} f(z) dz$ is

  1. $1$
  2. $0$
  3. $-1$
  4. $-2$
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