−y+1y−1-\frac{y+1}{y-1}−y−1y+1
y+1y−1\frac{y+1}{y-1}y−1y+1
−y−1y+1-\frac{y-1}{y+1}−y+1y−1
x+1x−1\frac{x+1}{x-1}x−1x+1
No correct answer
