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三角函数的研究对象就其原始意义来说是角和线段比的对应关系,以后逐步抽象为两个数的对应关系,但应用三角函数解决实际问题仍然离不开它的几何意义,可是研究三角函数所应用的方法主要是解析方法,大量用到各种式的变换以及方程的同解变形,而且,由于要用代数方法去解决几何问题,就必须形成一系列公式,何况为了适应这种需要,把对应于角的各种线段比分别给以一个特定的符号,这些符号掩盖了它所代表的线段比的实质。这样形成的公式,就往
In the original sense, the research object of trigonometric function is the correspondence between angle and line segment ratio, and then gradually abstracted as the correspondence between two numbers. However, it is still inseparable from its geometric meaning to solve trigonometric functions. However, The method used by the function is mainly analytic method, which is widely used in various kinds of transformations and the same solution of equations. Moreover, due to the algebraic method to solve the geometric problems, a series of formulas must be formed. Moreover, in order to meet this need , Each corresponding to the corner of the various segments were given a specific symbol, these symbols masked line segment ratio it represents the essence. The formula so formed goes