x-3-y-3-dx-3xy-dy-0-

Question Number 127723 by bemath last updated on 01/Jan/21

$$\:\left(\mathrm{x}^{\mathrm{3}} +\mathrm{y}^{\mathrm{3}} \right)\:\mathrm{dx}\:−\mathrm{3xy}\:\mathrm{dy}\:=\:\mathrm{0}\:? \\ $$