Evaluate ∫xx2+1dx\int \frac{x}{x^2+1} dx∫x2+1xdx.
arctan(x)+C\arctan(x) + Carctan(x)+C
12ln(x2+1)+C\frac{1}{2} \ln(x^2+1) + C21ln(x2+1)+C
ln(x2+1)+C\ln(x^2+1) + Cln(x2+1)+C
12arctan(x)+C\frac{1}{2} \arctan(x) + C21arctan(x)+C