三角是形数结合而成的一个数学分支,它与几何的密切关系已为大家所熟知;一些“三角恒等式”“三角方程”问题通过变量代换而化为代数问题,这也是常见的。本文则试图引进“三角模式”这一思想,并借此把代数问题化为三角问题来求解。三角函数之间有一系列的关系式,这儿,我 Triangle is a branch of mathematics formed by the combination of numbers. Its close relationship with geometry has been known to everyone; some “trigonometric identity” and “triangular equation” problems are replaced by algebraic problems through variable substitution. This is also common. This article tries to introduce the idea of ​​“triangular mode” and use it to solve the problem of algebra as a triangular problem. There are a series of relations between the trigonometric functions, here, I