Evaluate $\displaystyle \int^{2x}_{0} arctan(t)\,dt$ at $\displaystyle x=1/2$
Evaluate $\displaystyle \int^{2x}_{0} arctan(t)\,dt$ at $\displaystyle x=1/2$
$\displaystyle u = \arctan(t)$
$\displaystyle dv = dx$