(通用版)2020版高考数学大一轮复习第18讲同角三角函数的基本关系式与诱导公式课件理新人教A版.pptx

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课前双基巩固课堂考点探究教师备用例题,考试说明,知识聚焦,sin2+cos2=1,-sin ,-cos ,-sin ,-cos ,-sin ,tan ,-tan ,对点演练,题组一 常识题,题组二 常错题,索引:平方关系没有考虑角的象限导致出错;扩大角的范围导致出错;不会运用消元的思想;k形式没有把k按奇数和偶数进行分类讨论导致出错.,探究点一 三角函数的诱导公式,探究点二 同角三角函数的基本关系,微点1 切弦互化,微点2 “1”的变换,微点3 和积转换,应用演练,【备选理由】例1进一步考查利用诱导公式进行化简与求值;例2考查弦切互化,是平方关系及商数关系的综合应用;例3结合导数的几何意义得出tan ,再巧妙使用sin2+cos2=1代换求值;例4考查sin +cos 与sin -cos 之间的转换,对于sin +cos ,sin cos ,sin -cos 这三个式子,利用(sin cos )2=12sin cos 可以知一求二.,

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