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数学思想方法的渗透,有助于我们理性数学思维能力的提高,从而提高我们在对问题进行分析、解决的能力。“两角差的余弦公式”在推导过程中具有重要的教育价值,蕴涵着换一个角度看问题的转换思想,是数学家创造发明的法宝,也是我们进行再发现、再创造活动的探索方式。本文针对“两角差的余弦公式的推导”章节进行学习,分析并推导两角差的余弦公式,实践检验。笔者在近年来的各省数学高考试卷中发现,经常会出现
The penetration of mathematical ideas and methods helps us improve our ability to think rationally in mathematics and enhance our ability to analyze and solve problems. “The cosine formula of difference between two angles ” has important educational value in the process of deduction, implies the conversion thought of changing the problem from one angle of view, is the magic weapon that the mathematician creates the invention, is also our exploration that rediscovers, re-creates the activity the way. In this paper, we study, analyze and derive the cosine formula of the difference between the two corners for the test of “the derivation of the cosine formula of the difference between the two angles ”. In recent years, the author found in mathematics college entrance examination papers, often appear