正弦定理和余弦定理是解斜三角和判定三角类型的重要工具,其主要作用是将已知条件中的边、角关系转化为角的关系或边的关系.在近年高考中主要有以下五大命题热点:一、求解斜三角形中的基本元素是指已知两边一角(或二角一边或三边),求其他三个元素问题.【例1】在△ABC中,a、b、c The sine theorem and cosine theorem are important tools for solving oblique triangles and judging triangular types. Their main function is to convert the relationship between edges and angles in known conditions to the relationship of angles or edges. There are five major propositions in recent college entrance examinations. Hotspots: 1. Solving the basic elements in an oblique triangle means knowing the corners of one side (or two sides or three sides) and asking for the other three elements. [Example 1] In ABC, a, b, c