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三角变换是高中数学中一个极具思维性和技巧性的教学内容．三角变换中涉及的公式多,问题的变化多,解法的选择多．是学生在数学学习中的一个难点．怎样解好三角变换题呢?我的体会是把握四个“策略”．认真观察和思考题设条件与求解内容之间在“角”,“型”,“函数名称”,“隐含条件”等方面的特征和规律,通过各种手段找到前后之间的联系,从而变换思路．
3. Trigonometry is a very thinking and skillful teaching content in high school mathematics. There are many formulas involved in the triangular transformation, there are many changes in the problem, and there are many choices of solutions. It is a difficult point for students to study in mathematics. How to solve the triangle problem? My experience is to grasp the four “strategies.” Observe and think carefully about the characteristics and laws in the aspects of “angle”, “type”, “function name”, “implicit condition”, etc. between the conditions of the title setting and the content of the solution, and find the connection between the front and the back through various means. Change ideas.