lim( x→0)sin2x / tan3x
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lim( x→0)sin2x / tan3x
lim( x→0)sin2x / tan3x
lim( x→0)sin2x / tan3x
利用等价无穷小,当x→0,sin2x→2x,tan3x→3x,所以结果就为2/3
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