7.1 Integration By Parts/13

Failed to parse (unknown function "\quaddt"): {\displaystyle \int t\sec^2\left(2t\right)\quaddt }

$u=t\qquad dv=\sec ^{2}\left(2t\right)$

$du=dt\qquad v={\frac {1}{2}}\tan \left(2t\right)$