lim(x->0)ln(cosx)^1/x^2怎么算
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lim(x->0)ln(cosx)^1/x^2怎么算
式子化为
ln(cosx)/x^2=ln(cosx-1+1)/x^2=(cosx-1)/x^2=-x^2/2x^2=-1/2
ln(cosx)/x^2=ln(cosx-1+1)/x^2=(cosx-1)/x^2=-x^2/2x^2=-1/2
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