解三角题一般是通过三角函数恒等变形来完成,这种方法是晟基本的,也是很重要的方法.有些三角题,除了常规方法外,还可根据题目所提供的信息,通过观察、联想,往往可以构造设计一个恰当的三角形,借助于平面几何、解三角形等知识去解决,这种解法新颖巧妙,既能促成数形结合思想方法的运用,又能提高数学素养. The solution to the trigonometric problem is generally accomplished through trigonometric constant deformation. This method is a basic and important method. In addition to the conventional methods, some trigonometric problems can also be observed and correlated according to the information provided by the topic. It is often possible to construct and design an appropriate triangle, solve it with the aid of plane geometry, solve triangles, etc. This solution is novel and ingenious, which can not only promote the use of number and shape, but also improve the quality of mathematics.