tanα=2,sin²α-2sinαcosα+2=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/11 05:25:17
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tanα=2,sin²α-2sinαcosα+2=?
tanα=2,sin²α-2sinαcosα+2=?
tanα=2,sin²α-2sinαcosα+2=?
sin²α-2sinαcosα+2
=(sin²α-2sinαcosα)/(sin²α+cos²α)+2
分子分母同时除以cos²α
=(tan²α-2tanα)/(tan²α+1)+2
=0+2
=2