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《正弦》是薛凤祚的重要译著之一。深入分析此书中的内容、方法和数值等,可以发现,尽管书中给出的内容稍显繁乱,但思路是明确的,方法是科学的,计算是正确的;书中内容主要来自斯蒂文的《数学记忆》一书第一部分的第一卷“正弦表制作方法”;薛凤祚在编译此书时并非墨守成规,而是在底本方法的基础上给出了一种更为合理和经济的新方法,以精密快捷的计算推进了当时正弦函数造表方法的研究。
“Sine” is one of the important translations of Xue Fengtao. An in-depth analysis of the contents, methods, and values in this book shows that although the content given in the book is a bit confusing, the idea is clear, the method is scientific and the calculation is correct. The content of the book mainly comes from Steele Text “Mathematical Memory,” the first volume of the first volume of a book “sine table production method ”; Xue Feng 祚 in the compilation of the book is not stick to the rules, but in the end of this method gives a more reasonable and economical The new method, with precision and quick calculation of the sine function at that time to promote the study of the table method.