∫x^2/1+X dx.

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∫x^2/1+Xdx.∫x^2/1+Xdx.∫x^2/1+Xdx.∫x^2/1+Xdx=∫（x^2-1+1）/1+Xdx=∫x-1+1/(1+x)dx=x²/2-x+ln|x+1|+c

∫x^2/1+X dx.
∫x^2/1+X dx.

∫x^2/1+X dx.
∫x^2/1+X dx
=∫（x^2-1+1）/1+X dx
=∫x-1+1/(1+x)dx
=x²/2-x+ln|x+1|+c

∫[dx/(e^x(1+e^2x)]dx ∫1+2x/x(1+x)*dx∫1+2x/x(1+x) * dx ∫(x-1)^2dx, ∫x^1/2dx ∫1/x^2+x+1dx ∫1/(x^2+x+1)dx ∫dx/x^2(1-x^2) ∫dx/x^2(1+x^2) ∫X^2/1-x^2 dx. ∫X^2/1-x^2 dx. ∫ (x+arctanx)/(1+x^2) dx ∫（x^2+1/x^4)dx ∫2 -1|x²-x|dx ∫x^2/1+X dx. ∫ xe^x/(1+x)^2 dx ∫dx/[(1-x)x^2] ∫ x/(1+X^2)dx= ∫(2x)/(1+x²)dx