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If $z$ is a complex variable, the value of $\displaystyle{} \int_{5}^{3i}\dfrac{dz}{z}$ is

  1. $− 0.511−1.57i$
  2. $− 0.511+1.57i$
  3. $0.511− 1.57i$
  4. $0.511+1.57i$
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