三角函数是中学数学的重要内容之一,是高考的重点和热点.在历年的高考中,三角函数作为重要考点一般至少有一道大题和两道小题,难度中等,并且大题中的三角函数题往往出现在前三个大题中,所以此类题目能否顺利求解直接影响到学生后面的考试心态.三角变换是运算化简过程中运用较多的,所以提高三角变换能力,学会设置条件,灵活运用三角公式,掌握运算化简的方法和技能是解好三 Trigonometric function is one of the important content of the middle school mathematics, is the focus of college entrance examination and hot.In the college entrance examination in the calendar year, the trigonometric function as an important test center generally have at least one big problem and two small problems, the difficulty is medium, and the big triangle Function problems often appear in the first three big questions, so the problem can be successfully solved directly affect the students behind the test mentality.Change transformation is the operation of the process of simplifying more, so to improve the ability of the triangle transform, learn to set Conditions, flexible use of trigonometric formulas, mastery of methods and skills of operation is a good solution