(x+1)/(2x-2) =(x+1)/2(x-1) =(x+1)*(x+1) / 2(x-1)(x+1) =(x+1)² /2(x-1)(x+1).
x²/(2x² -2) =x²/2(x² -1) =x²/2(x -1)(x+1) .
(2x+3)/(x+1) =2(x-1)*(2x+3)*) /(x+1)*2(x-1) .
* * * 2(x-1)(x+1) =2x² -2 * * *
----------
1/(2-y) = -2y(y+2) / 2(y-2)(y+2).
1/(2+y)= 2y(y-2) / 2(y-2)(y+2) .
(y² +4)/(2y³ -8y) =(y² +4)/ 2y(y -2)(y+2) .