如图，点C为⊙O的直径AB上一动点，，过点C作交⊙O于点D、E，连结AD

如图，点C为⊙O的直径AB上一动点，，过点C作交⊙O于点D、E，连结AD，．当点C在AB上运动时，设的长为x，的面积为，下列图象中，能表示与的函数关系的图象大致是

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如图，点C为⊙O的直径AB上一动点，，过点C作交⊙O于点D、E，连结AD

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