Venerable Soul!
Number Theory
Level
3
Find \(\sum(x+y)\) if \((x,y)\) indicates the pairs that are the solutions of the equation- \[(x^{2}+1)(y^2+1)+2(x-y)(1-xy)=4(1+xy)\]
\(x,y \in \mathbb{Z}\)
Note-This problem is not mine. \(\sum(x+y)\) indicates sum of all pairs satisfying the equality
by
Krishna Ar