WolframAlpha computational knowledge AI
((X4 – (X2-2X+1 ))/((X2+2X+1) - X2))+ (X2 – X4 + 2X2 -1)/( X2(X2+2X+1 ) -1) + (X2 (X2- 2X +1) -1)/(X4-(X2+2X+1)