\(\int_a^b f(x) d x\) is equal to :

\(\int_a^b f(a-x) d x\)

\(\int_a^b f(a+b-x) d x\)

\(\int_{\mathrm{a}}^{\mathrm{b}} \mathrm{f}(\mathrm{x}-(\mathrm{a}+\mathrm{b})) \mathrm{dx}\)

\(\int_{\mathrm{a}}^{\mathrm{b}} \mathrm{f}((\mathrm{a}-\mathrm{x})+(\mathrm{b}-\mathrm{x})) \mathrm{dx}\)