https://baijiahao.baidu.com/s?id=1701558940866248208&wfr=spider&for=pc&searchword=%E6%9C%80%E9%80%9F%E8%90%BD%E5%BE%84

https://en.wikipedia.org/wiki/Brachistochrone_curve#Newton's_solution

奇怪我很久之前看的资料说牛顿的解法遗失了，今天另外一个版面有人给了链接。
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