三角函数是中学数学的重要内容之一.这部分内容难点集中,公式繁多,高考题型变化多样.但三角函数的求值、化简、证明,其实质是把一个表达式变形成另一个和它恒等的表达式,尽管三角题目千变万化,但只要对题目的结构进行分析,选择适当的配凑技巧,就能有效地找到解题的思路,简化解 The trigonometric function is one of the important contents of middle school mathematics. This part is difficult to focus on, the formulae are numerous, and the college entrance examination questions vary. However, the trigonometric function’s evaluation, simplification, and proof are essentially to transform one expression into another. Its constant expression, despite the ever-changing trigonometry, but as long as the analysis of the structure of the title, select the appropriate matching skills, you can effectively find ideas to solve the problem, simplify the solution