问题标题:
定积分∫10(x/(1+x^2))dx
问题描述:
定积分∫10(x/(1+x^2))dx
乐忠法回答:
∫(0→1)x/(1+x²)dx
=½∫(0→1)dx²/(1+x²)
=½∫(0→1)d(1+x²)/(1+x²)
=ln(1+x²)(0→1)
=½[ln2-ln1]
=½ln2
≈0.3466
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