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Please can somebody give me hint for this?

For $n\ne -1$ $$\frac{1}{2\pi i}\int_{C} z^ndz=0$$

Where C is a simple closed curve with the usual positive orientation and its inside.

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    Where is $f$ mentioned in the problem?2012-04-19
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    @AlexBecker: It is just a typo, I fix it. Thanks.2012-04-19
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    Is $n$ an integer? For $n=1/2$, this is false...2012-04-19

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