my question is , let us have the following complex integral(adsbygoogle = window.adsbygoogle || []).push({});

[tex] \oint f(z)dz [/tex] where f(z) has a simple pole at [tex] z=\infty [/tex]

then by Residue theorem [tex] \oint f(z)dz =2\pi i Res(z,\infty,f(z) [/tex]

or equal to the limit [tex] (z-\infty )f(z) [/tex] with 'z' tending to infinity

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# Cauchy residue theorem

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