这么做还是得不出答案的.lim(tanx-sinx)/x^3=lim (sinx/cosx-sinx)/x^3 =lim sinx/x^3*(1-cosx)/cosx (x->0) =lim(1-cosx)/x^2= lim 2(sinx/2)^2/x^2=1/2
lim(tanx-sinx)/x^3=lim tanx/x^3-lim sinx/x^3=limx/x^3-limx/x
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