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三角函数的值域是三角函数的重要性质之一,它是研究三角函数其他性质和处理三角函数综合问题的基础.面对灵活多样的三角函数的值域问题,学生常常因为三角公式的庞杂、三角恒等变换的灵活及运算的复杂等而不知该如何入手,或者会解而算不对.因此,在高三的复习教学中,不仅让学生能对众多的公式灵活运用,更重要的是要有解题策略,笔者通过多年的教学实践认为:变式训练是训练学生解题策略的重要方法之一.
The range of trigonometric functions is one of the important properties of trigonometric functions, which is the basis for the study of other properties of trigonometric functions and dealing with the synthesis of trigonometric functions.Facing the range of trigonometric functions with flexible and diverse functions, students often because of the complexity of the trigonometric formula, Triangle transformation and so the flexibility of the complexity of the operation, but I do not know how to start, or will be solved and not right.Therefore, the review in the third year of teaching, not only allows students to flexibly use a large number of formulas, more importantly, there must be Problem solving strategy, the author through years of teaching practice that: variant training is one of the important ways to train students to solve the problem.