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求解与三角函数有关的问题时 ,经常需要考虑问题中所涉及的角度的取值范围 .通过多次的探讨 ,现归纳出角的取值范围在解题过程中的五种基本的功能 .1 估算功能根据具体问题与其所涉及的角度的某种内在联系 ,通过估算角的取值范围 ,从而准确快速地作答 .这一功能在求解选择题?
When solving problems related to trigonometric functions, it is often necessary to consider the range of values involved in the problem. Through several discussions, the five basic functions of the range of angles in the problem solving process are summarized. The function of the estimation is based on a certain kind of intrinsic connection between the specific problem and the angle it is involved in, and it can accurately and quickly answer the problem by estimating the value range of the angle. This function is to solve multiple choice questions.