积分下限负无穷,上限正无穷 dx/(1+x^2)=

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积分下限负无穷,上限正无穷dx/(1+x^2)=积分下限负无穷,上限正无穷dx/(1+x^2)=积分下限负无穷,上限正无穷dx/(1+x^2)=∫(-∞,+∞)dx/(1+x^2)=2∫(0,+∞)d

积分下限负无穷,上限正无穷 dx/(1+x^2)=
积分下限负无穷,上限正无穷 dx/(1+x^2)=

积分下限负无穷,上限正无穷 dx/(1+x^2)=
∫(-∞,+∞)dx/(1+x^2)
=2∫(0,+∞)dx/(1+x^2)
=2arctanx ( 0,+∞)
=2[(π/2)-0]