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lim(x→∞)[sinx/x+xsin(1/2x)]
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高数题一道.当x->0时,(1-cosx)ln(1+x^2)是比xsin(x^n)高阶的无穷小,而xsin(x^n)是比
lim x→0[∫上x下0 cos(t^2)dt]/x ; lim x→0[∫上x下0 ln(1+t)dt]/(xsin