极值法,就是取极值,取物理量的极大值或极小值后再进行分析、推断的一种运算方法.在解答物理题的过程中,能够灵活选用极值法运算,大大提高了解题速度,增强了解题的正确率.一、利用三角函数法进行相关的极值计算物理是一门及多门学科于一体的知识运用性学科.在我们解物理习题时很多时候会用到相关的数学方法来进行相关的极值计算.三角函数法是一种常见的极值计算方法. Extremum method is to take the extreme value, take the maximum or minimum physical value analysis, inferred a computing method.In the process of solving physical problems, the flexibility to use the extreme value method, greatly increased Problem-solving speed and enhance the accuracy of problem-solving.First, the use of trigonometric function method to calculate the extremum related physics is one of the subjects and multi-disciplinary knowledge in the use of disciplines.When we solve physics exercises often use To the relevant mathematical method to carry out the relevant extremum calculation.Triangle function method is a common extreme value calculation method.