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∫(arctanx)^2/(1+x^2)dx=
人气：469 ℃ 时间：2020-02-05 16:17:57
解答
∫(arctanx)^2/(1+x^2)dx=
=∫(arctanx)^2d(arctanx)
=1/3 (arctanx)^3 +c
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