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已知△ABC的面积S满足,的夹角为θ.(Ⅰ)求θ的取值范围;(Ⅱ)求函数f(θ)=sin2...
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已知△ABC的面积S满足
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAKIAAAAWCAYAAABDqUd4AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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)
,
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAD0AAAAWCAYAAABzCZQcAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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/w8tXdFf9fcnO/0GaEuomLCXgoEAAAAASUVORK5CYII=
)
的夹角为θ.
(Ⅰ)求θ的取值范围;
(Ⅱ)求函数f(θ)=sin
2θ+2sinθcosθ+3cos
2θ的最大值.
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