Wrong topic summary of integral(1)

\begin{aligned}
\int \frac {x} {(x+2)^3} \,{\rm d}x & = \int \frac {(x+2)-2} {(x+2)^3} \, {\rm d}x \\
& = \int \frac {1} {(x+2)^2} \, {\rm d}x - 2 \int \frac {1} {(x+2)^3} \, {\rm d}x \\
& = \int \frac {1} {(x+2)^2} \, {\rm d}(x+2) - 2 \int \frac {1} {(x+2)^3} \, {\rm d}(x+2) \\
& =
\end{aligned}