广义积分(下限-∞,上限∞)∫ 1/x^2+4x+5 dx怎么算呢?
人气:105 ℃ 时间:2020-04-26 03:00:52
解答
∫ 1/x^2+4x+5 dx
=∫ 1/(x+2)^2+1 dx
=arctan(x+2)(下限-∞,上限∞)=π/2-(-π/2)=π
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