單項選擇題函數(shù)f(x)=|(sinx)/x|在x=π處的()

A.導(dǎo)數(shù)f′(π)=π
B.導(dǎo)數(shù)f′(π)=1/π
C.左導(dǎo)數(shù)f′(π)=π
D.右導(dǎo)數(shù)f′(π)=1/π


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