Question Number 115205 by mohammad17 last updated on 24/Sep/20
Answered by 1549442205PVT last updated on 24/Sep/20
$$\left.\mathrm{Graph}\:\mathrm{of}\:\:\mathrm{f}\left(\mathrm{x},\mathrm{y}\right)=\frac{\mathrm{1}}{\mathrm{x}^{\mathrm{2}} +\mathrm{y}^{\mathrm{2}} }\Rightarrow\mathrm{choose}\:\mathrm{a}\right) \\ $$