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If i = $\sqrt{-1}$, the value of the integral

                                                        $\oint_{c}$$\frac{7z + i}{z(z^2 + 1)}$dz                         |z|<2,

using the cauchy residue theorem is

  1. 2$\pi$i
  2. 0
  3. -6$\pi$
  4. 6$\pi$
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