选择题:下列函数中在定区满足拉格朗日中值定理条件的是()Ay=|x|,[-2,1]By=cosx,[2,6]

题目内容:
下列函数中在定区满足拉格朗日中值定理条件的是()
Ay=|x|,[-2,1]
By=cosx,[2,6]
Cy=x^2/3,[-2,1]
Dy=1/x-3,[2,6]
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