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Stub following the same pattern as tangent function.
That’s a cool series expansion, and I’m tempted to write it as
$\cot(\pi x) = \sum_{n\in \mathbb{Z}} \frac{1}{x-n}$Yes, and people often do suggestively write the sum like that, although the convergence is less apparent when written that way.
Thanks for spotting that missing $\pi$ on the left.
It was John B who pointed it out when I tweeted the cute but incorrect version earlier :-)
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