附录2是我为解此题推导出来的公式。后来发现一千四百多年前印度数学家就已经发现了这个公式。

来源: 大酱风度于 2023-11-14 10:39:36 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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