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三角函数作为高考的必考考点之一,一直都是老师和学生关注的对象.在三角函数中,三角变换一直是其基础和难点.三角变换因方法多样,形式灵活,长期以来,都是学生比较头痛的知识点之一.常用的三角变换方法有:(1)公式变形与逆用;(2)升幂与降幂;(3)“1”的代换;(4)辅助角的引入;(5)和积互化等.对于方法,学习之后,学生都能有所了解和掌握,关键是遇到问题如何灵活运用
Trigonometric function as one of the necessary entrance exams for college entrance examination, has always been the object of attention of teachers and students in the trigonometric functions, the triangle transformation has always been its foundation and difficulties .Change transformation due to diverse methods and flexible forms, for a long time, are students Compare one of the knowledge points of headache. Commonly used method of triangle transformation: (1) formula deformation and inverse; (2) ascending and descending power; (3) “1 ” substitution; (4) (5) integration and integration, etc. For the method, after learning, students can understand and master, the key is how to use the problems encountered