(x*arctan(x))/(1+x^2)^2,求积分
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(x*arctan(x))/(1+x^2)^2,求积分(x*arctan(x))/(1+x^2)^2,求积分(x*arctan(x))/(1+x^2)^2,求积分(x*arctan(x))/(1+x^
(x*arctan(x))/(1+x^2)^2,求积分
(x*arctan(x))/(1+x^2)^2,求积分
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