Find ddx(xarctanx−12ln(1+x2))\frac{d}{dx} (x \arctan x - \frac{1}{2} \ln(1+x^2))dxd(xarctanx−21ln(1+x2)).
arctanx\arctan xarctanx
xarctanxx \arctan xxarctanx
ln(1+x2)\ln(1+x^2)ln(1+x2)
11+x2\frac{1}{1+x^2}1+x21