求解一道积分x^2/(e^x+1)(e^-x+1)从-∞积分到+∞

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求解一道积分x^2/(e^x+1)(e^-x+1)从-∞积分到+∞求解一道积分x^2/(e^x+1)(e^-x+1)从-∞积分到+∞求解一道积分x^2/(e^x+1)(e^-x+1)从-∞积分到+∞注

求解一道积分x^2/(e^x+1)(e^-x+1)从-∞积分到+∞
求解一道积分x^2/(e^x+1)(e^-x+1)从-∞积分到+∞

求解一道积分x^2/(e^x+1)(e^-x+1)从-∞积分到+∞
注意在计算积分x/(e^x+1)的时候引入级数即可.