作业帮怎么解lim[（sinx-tanx）/x^3]=
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怎么解lim[（sinx-tanx）/x^3]=
怎么解lim[（sinx-tanx）/x^3]=
怎么解lim[（sinx-tanx）/x^3]=
=lim (sinx /x)·[(1-1/cos x)/x²]
=1·lim[(cosx -1)/x²]
=lim[-(x²/2) /x²]
= -1/2