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在“两角和与差的三角函数”一章中,一类求值问题是教学中的难点。这类习题数量多,形式广,难度大。比如,不查表,求下列各式的值: 能突破一道、二道,还未必能解另外几道。如果教师漫无边际地大量布置题目,使学生置于题海之中,这势必增加学生负担。因此,在解题教学的过程中有必要引导学生观察求值问题的特
In the chapter “Trigonometric Functions of Two Corners and Differences”, a class of evaluation problems is a difficulty in teaching. There are many types of exercises in this category, which are widely used and difficult. For example, instead of looking up the table, ask for the following types of values: You can break one, two, and not necessarily solve the other. If teachers have arranged a large number of subjects in a boundless manner, students will be placed in the sea of questions, which will inevitably increase the burden on students. Therefore, it is necessary to guide students in the process of problem-solving teaching to observe the special issues of the evaluation.