曲线y=sinx2(2x−1)y=\dfrac{\sin x}{2(2x - 1)}y=2(2x−1)sinx的铅直渐近线( ).
(A)是x=0x = 0x=0
(B)是x=12x=\dfrac{1}{2}x=21
(C)是y=0y = 0y=0
(D)不存在
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