(ln(1+x))^2-X^2/(1+x)
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∫ln^2x / x(1+ln^2x) dx =∫(ln^2x +1-1)/(1+ln^2x)d(lnx) X呢
求导y=ln ln ln(x^2+1)
(ln(1+x))^2-X^2/(1+x)
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