tan=3,3sin^2θ-sinθcosθ+2=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/21 06:16:34
![tan=3,3sin^2θ-sinθcosθ+2=?](/uploads/image/z/10152406-46-6.jpg?t=tan%3D3%2C3sin%5E2%CE%B8-sin%CE%B8cos%CE%B8%2B2%3D%3F)
tan=3,3sin^2θ-sinθcosθ+2=?
tan=3,3sin^2θ-sinθcosθ+2=?
tan=3,3sin^2θ-sinθcosθ+2=?
tan=sinθ/cosθ=3 sinθ=3cosθ
sinθ=(3√10)/10 cosθ =√10/10 或 sinθ=(-3√10)/10 cosθ =-√10/10
3sin^2θ-sinθcosθ+2
=9sinθcosθ-sinθcosθ+2
=8sinθcosθ+2
=4.4