Question Number 7791 by Tawakalitu. last updated on 15/Sep/16
Commented by prakash jain last updated on 15/Sep/16
$$\mathrm{What}\:\mathrm{is}\:{d}\:\mathrm{in}\:\mathrm{the}\:\mathrm{question}\:\mathrm{above}? \\ $$
Commented by Chantria last updated on 16/Sep/16
$${may}\:{be} \\ $$$$\:{a}^{\mathrm{2}} +{b}^{\mathrm{2}} ={c}^{\mathrm{2}} +{d}^{\mathrm{2}} \\ $$