三角恒等变换是高中数学的重要内容之一,历年的高考都有所涉及.三角恒等变换的常用方法包括化弦、化切、变角、生幂、降幂、和积互化等,其中“变角”既是三角恒等变换中的关键,又是学生学习的一个难点.在实际应用中,我们常需要将角做适当变换,配出有关角,便于连接已知角与未知角之间的关系,因此寻找角与角之间的关系是解题的切入点.下面通过对例题的讲解来强化“变角”的技巧及其 Triangle constant transformation is one of the important contents of high school mathematics, which has been involved in the college entrance examination over the years.Traditional methods of triangular identity transformation include string, cut, angle, power, power, Among them, “change angle ” is not only the key to the triangle transformation, but also a difficult point for students to learn.In practice, we often need to make the appropriate transformation of the angle, with the relevant angle, easy to connect the known angle and unknown The relationship between the angle, so looking for the relationship between the angle and angle is the entry point to solve the problem. The following examples through the explanation to strengthen the “change angle” skills and their