∫[(3x^4+3x^2+1)/x^2+1]dx

问题描述:

∫[(3x^4+3x^2+1)/x^2+1]dx
RT

(3x^4+3x^2+1)/(x^2+1)
=3x^2+1/(x^2+1)
求导后
6x-2x/(x^2+1)^2