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The Flip command flips the limits of integration of v: ${\int }_a^{b}f\left(x\right)\ⅆx=-{\int }_b^{a}f\left(x\right)\ⅆx$.

$\mathrm{with}\left(\mathrm{IntegrationTools}\right)\:$

$v≔\mathrm{Int}\left(f\left(x\right)\,x=a..b\right)$

$v≔{\int }_a^{b}f\left(x\right)\ⅆx$

$\mathrm{Flip}\left(v\right)$

$-{\int }_b^{a}f\left(x\right)\ⅆx$