x-2-y-2-dxdy-D-x-4-y-4-1-

Question Number 194785 by tri26112004 last updated on 15/Jul/23

$$\int\int\:{x}^{\mathrm{2}} +{y}^{\mathrm{2}} \:{dxdy}\:\left({D}={x}^{\mathrm{4}} +{y}^{\mathrm{4}} \leqslant\mathrm{1}\right) \\ $$