Question Number 80485 by jagoll last updated on 03/Feb/20
$${what}\:{is}\:{the}\:{king}\:\:{rule}? \\ $$
Commented by mr W last updated on 03/Feb/20
$${in}\:{mathematics}? \\ $$$${then}\:{king}\:{rule}\:{is} \\ $$$$\int_{{a}} ^{{b}} {f}\left({x}\right){dx}=\int_{{a}} ^{{b}} {f}\left({a}+{b}−{x}\right){dx} \\ $$