积分下限负无穷,上限正无穷 dx⼀(1+x^2)=

2025-05-11 01:56:09
推荐回答(1个)
回答1:

∫(-∞, +∞)dx/(1+x^2)
=2∫(0, +∞)dx/(1+x^2)
=2arctanx ( 0, +∞)
=2[(π/2)-0]