Question

∫(1/（x4+1)）dxx的四次方+1的倒数的积分

Answer 1

(1/8)*根号(2)*ln((x^2+x*根号(2)+1)/(x^2-x*根号(2)+1))+(1/4)*根号(2)*arctan(x*根号(2)+1)+(1/4)*sqrt(2)*arctan(x*根号(2)-1)