当x→0x→0x→0时,以下是等价无穷小的是( ).
(A)1−cosx1 - \cos x1−cosx与x22\dfrac{x^2}{2}2x2
(B)xxx与tanx\tan xtanx
(C)x−sinxx - \sin xx−sinx与xxx
(D)1−cosx1 - \cos x1−cosx与2x2x2x
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