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广义积分∫ (正无穷,1) [arctanx/(1+x^2)^3]dx
广义积分∫ (正无穷,1) (arctanx/1+x^2)dx
∫(0 1)x(arctanx)^2dx
高数极限问题:求lim(π/2-arctanx)^(1/lnx) (x趋于正无穷),急
求lim x趋向于0(arctanx)/(x^2+1)
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