当x→0x \to 0x→0时,1+x2−1\sqrt{1 + x^{2}} - 11+x2−1是arctanx3\arctan x^{3}arctanx3的( ).
(A)等价无穷小
(B)同阶非等价无穷小
(C)高阶无穷小
(D)低阶无穷小
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