Tutorial Exercise

Write as a single integral in the form ${\displaystyle \underset{a}{\overset{b}{}}}f(x)dx.$

${\displaystyle \underset{-3}{\overset{1}{}}}f(x)dx+{\displaystyle \underset{1}{\overset{2}{}}}f(x)dx-{\displaystyle \underset{-3}{\overset{-2}{}}}f(x)dx$