lim [ln(1+ax^2)]/(x sinx) (x趋近于0负)
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lim[ln(1+ax^2)]/(xsinx)(x趋近于0负)lim[ln(1+ax^2)]/(xsinx)(x趋近于0负)lim[ln(1+ax^2)]/(xsinx)(x趋近于0负)利用等价无穷小
lim [ln(1+ax^2)]/(x sinx) (x趋近于0负)
lim [ln(1+ax^2)]/(x sinx) (x趋近于0负)
lim [ln(1+ax^2)]/(x sinx) (x趋近于0负)
利用等价无穷小:ln(1+ax^2)~ax^2
sinx~x
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