Evaluate ∫arctan(x) dx\int \arctan(x)\,dx∫arctan(x)dx.
xarctanx−12ln(1+x2)+Cx\arctan x - \frac{1}{2}\ln(1+x^2) + Cxarctanx−21ln(1+x2)+C
xarctanx+Cx\arctan x + Cxarctanx+C
x22⋅11+x2+C\frac{x^2}{2} \cdot \frac{1}{1+x^2} + C2x2⋅1+x21+C
xarctanx+12ln(1+x2)+Cx\arctan x + \frac{1}{2}\ln(1+x^2) + Cxarctanx+21ln(1+x2)+C