一天晚自习的时候,一位学生问一道有关力学问题,我想了好一会还没能解出,便看了解题的答案,发现问题中并非直角三角形,但解答过程中却用到了三角函数。我正疑惑不解时,又一位学生也看了答案,说这是个数学结论。事后我经过认真思考,并将整个思考、解答和反思的过程做了如下记录,与大家分享。一、正弦定理在受力分析中的运用例1如图1所示,细绳下分别 One day a night study, a student asked a question about mechanics, I thought for a while not yet solved, then read the answer to the question and found that the problem is not a right triangle, but the process of using the triangle function. When I was puzzled, another student also read the answer, saying that this is a mathematical conclusion. Afterwards, after careful consideration, I made the following record of the whole process of thinking, answering and reflection, and sharing with you. First, the sine theory in the force analysis of the use of cases 1 shown in Figure 1, respectively, under the string