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笔者在上三角函数复习课时,曾碰到过这样一道例题:计算:cos15°+sin15°/cos15°-sin15°为了了解学生对三角函数知识的巩固程度,要求每位同学至少用三种不同的方法解答本题。学生的解答大大出乎我的意料之外。下面是学生给出的各种方法。
The author encountered such an example in the review of the trigonometric function: Calculate: cos15°+sin15°/cos15°-sin15° In order to understand the degree of consolidation of trigonometric knowledge, each student is required to use at least three different Methods to answer this question. The student’s answer was far beyond my expectation. Here are the various ways students give.