tan=3,3sin^2θ-sinθcosθ+2=?
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tan=3,3sin^2θ-sinθcosθ+2=?tan=3,3sin^2θ-sinθcosθ+2=?tan=3,3sin^2θ-sinθcosθ+2=?tan=sinθ/cosθ=3sinθ=3c
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