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笔者应江苏省太仓明德高级中学之邀,于去年年底前往该校进行教学交流,开设了两角和与差的余弦一节课,所用教材为苏教版的普通高中课程标准实验教科书——数学必修4,授课方式大胆尝试了整堂课都在引导学生“发现”两角差的余弦公式,以充分欣赏公式所蕴含的数学美.章建跃博士说过,在教学中,数学公式的“发现”要比“应用”更重要.本节课引导学生比较苏教版、沪教版、人教版中两角差的余弦公式的不同“发现”过程,让学生体会到公式
At the invitation of Taicang Matilda High School in Jiangsu Province, I went to the school for instructional exchange at the end of last year. I set up a course with two corners and a poor cosine. The textbook used is the Supagan version of the standard high school curriculum standard textbook - Mathematical compulsory 4, teaching mode Bold attempt to teach the whole class are in the classroom “found ” cosine formula of the difference between the two corners, in order to fully appreciate the mathematical implication of the formula.Dr. Zhang Jianyue said that in teaching, mathematical formula “Discover ” is more important than “Application ” This lesson guides students to compare the difference “discovery ” process of the difference between the two corners of the Sujiao, Shanghai PEP, PEP to let students Experience the formula