Step $2$

We also know that ${\displaystyle \underset{b}{\overset{a}{}}}f(x)dx=-{\displaystyle \underset{a}{\overset{b}{}}}f(x)dx.$ Therefore, we can say the fol

$-{\displaystyle \underset{-4}{\overset{-2}{}}}f(x)dx={\displaystyle \underset{-2}{\overset{-4}{}}}f(x)dx$

Step $3$

Using these results, we can say the following.

${\displaystyle \underset{-4}{\overset{1}{}}}f(x)dx{\displaystyle \underset{1}{\overset{4}{}}}f(x)dx-{\displaystyle \underset{-4}{\overset{-2}{}}}f(x)dx={\displaystyle \underset{-4}{\overset{4}{}}}f(x)dx{\displaystyle \underset{-2}{\overset{-4}{}}}f(x)dx$

$={\displaystyle \underset{\phantom{}}{\overset{x}{}}}f(x)dx$

$$ SKIP $($YOU CANNOT COME BACK$)$

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