关于三角函数有理值的一种新方法
A New Approach to Rational Values of Trigonometric Functions
摘要：
众所周知，sin（aπ/b），cos（aπ/b）等，只对少数几个选定的整数a和b是有理数。我们证明了这等价于这样一个事实：只有d = 1，2，3，4和6是Q上2次单位的本原d次单位根.
英文摘要：
It is well known that sin(aπ/b), cos(aπ/b), etc., are only rational numbers for a few select integers a and b. We show that this is equivalent to the fact that only for d = 1,2,3,4, and 6 is the primitive dth root of unity of degree 2 over Q.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
