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$$\int \mathrm{d}x$$
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This integral can be written as the series $$\sum_{k=0}^\infty 4^{-k}$$ which is a geometric series with common ratio $\frac{1}{4}$ \begin{align*} \sum_{k=0}^\infty 4^{-k} &= \frac{1}{1-\frac{1}{4}} \\ &= \frac{4}{3} \end{align*}
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