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题目(2006年重庆卷) (理)如图所示,单位圆中弧(?)的长为x,f(x)表示弧(?)与弦AB所围成的弓形面积的2倍,则函数y=f(x)的图像是( ).
Topics (Chongqing, 2006) () As shown in the figure, the length of the arc (?) in the unit circle is x, and f(x) is twice the arch area enclosed by the arc (?) and the chord AB. The image of function y=f(x) is ().