设为曲线上的点，且曲线在点处切线倾斜角的取值范围为，则点横坐

设为曲线上的点，且曲线在点处切线倾斜角的取值范围为，则点横坐标的取值范围为（）

A. B. C. D.

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设为曲线上的点，且曲线在点处切线倾斜角的取值范围为，则点横坐

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