karoeiu/8_sum_3.md Secret

Created September 27, 2021 07:22

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$\begin{align*} \left( \sum _{k = 1} ^{n} \frac{\sin k\pi x}{k\pi } \right) ^{2} = \sum _{k = 1} ^{n} \sum _{l = 1} ^{n} \frac{\sin k\pi x \cdot \sin l\pi x}{kl \pi^{2}} \end{align*}$

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