巧用构造数列法解决三角问题是一种解题技巧 ,它能沟通各门知识 ,但用构造数列法处理三角问题却极为少见 ,其实 ,用构造数列法解三角问题 ,往往能收到事半功倍之奇效 ,现举例说明如下 :1　构造等差数列法解三角问题 :根据条件构造等差数列 ,再利用等差数列的性质去解决 ,这种方 Cleverly constructing a series method to solve triangulation is a problem-solving technique. It can communicate all kinds of knowledge, but it is extremely rare to deal with trigonometric problems by constructing a sequence method. In fact, solving a triangular problem by constructing a sequence method can often yield a multiplier effect. The miraculous effect is illustrated as follows: 1 Construct the arithmetic progression method to solve the trigonometric problem: construct the arithmetic progression according to the conditions, and then use the nature of the arithmetic progression to solve the problem.