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The residue of the function $f(z)=\dfrac{1}{(z+2)^{2}(z-2)^{2}}$ at $z=2$ is

  1. $-\;\frac{1}{32}$
  2. $-\;\frac{1}{16}$
  3. $\frac{1}{16}$
  4. $\frac{1}{32}$
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