爱上海后花园

求极限lim(x->0) 1/x^3 {[(2+cosx)/3]^x-1}求极限lim(x->0)1/x^3 {[(2+cosx)/3]^x-1}

=1x^3e^[ln2cosxln3x]1e^x1x=1x^3[ln2cosxln3x]ln1xx=1x^2[2cosx31]=1x^2[cosx13]=1x^22sin^2x23=2312^2=16...

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