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[数列] Fibonacci数列 arctan之和

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hbghlyj posted 2023-4-18 17:36 |Read mode

来自递归数列 arctan之和
\[\sum_{n=1}^\infty\arctan\left(1\over3 F_n^2\right)=\frac\pi4\]

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2025-7-23 12:36 GMT+8

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