Question Number 58660 by Hassen_Timol last updated on 27/Apr/19
Commented by Hassen_Timol last updated on 27/Apr/19
$$\mathrm{Is}\:\mathrm{this}\:\mathrm{integral}\:\mathrm{calculation},\:\mathrm{correct}\:\mathrm{in}\:\mathrm{both} \\ $$$$\mathrm{the}\:\mathrm{way}\:\mathrm{it}\:\mathrm{is}\:\mathrm{written}\:\mathrm{and}\:\mathrm{the}\:\mathrm{result}\:\mathrm{obtained}? \\ $$
Commented by mr W last updated on 27/Apr/19
$${everything}\:{is}\:{correct},\:{but} \\ $$$$\int_{−\mathrm{3}} ^{+\mathrm{3}} {f}\left({x}\right){dx}=... \\ $$
Commented by Hassen_Timol last updated on 27/Apr/19
$$\mathrm{Ok}\:\mathrm{thank}\:\mathrm{you}\:\mathrm{Sir},\:\mathrm{what}\:\mathrm{is}\:{dx}? \\ $$
Commented by mr W last updated on 27/Apr/19
$${thing}\:{like}\:\int{f}\left({x}\right)\:{doesn}'{t}\:{exist}.\:{it}\:{is} \\ $$$$\int{f}\left({x}\right){dx}.\:{this}\:{is}\:{integral}\:{as}\:{it}\:{is}\:{defined}. \\ $$$${i}\:{suggest}\:{you}\:{to}\:{start}\:{with}\:{a}\:{text}\:{book} \\ $$$${about}\:{integral}\:{calculus}. \\ $$
Commented by Hassen_Timol last updated on 27/Apr/19
$$\mathrm{Thank}\:\mathrm{you}\:\mathrm{for}\:\mathrm{the}\:\mathrm{advice} \\ $$