2b/(2-b)
b=1/2 ( 2*1/2)/(2-1/2)=1:1 1/2=2/3
b=1 (2*1)/(2-1)=2/1=2
b=-1 (-1*2)/(2-(-1))=-2/(2+1)=-2/3
b=0 2*0/(2-0)=0
b=-1.2 (-1.2*2)/(2-(-1.2))=-2.4/3.2=(-24/10)/(32/10)=-24/32=-3/4
(y+2)/(y²-2)
y=0 (0+2)(0²-2)=2/(-2)=-1
y=-2 (-2+2)/((-2)²-2)=0/2=0
y=2 ( 2+2)/(2²-2)=4/2=2
y=4 (4+2) /(4²-2)=6/6=1
y=-1 1/3 (-1.1/3+2)/((-1 1/3)²-2=(-4/3)/(16/9-2)=(-4/3)(-2/9)=(-4/3)*(-9/2)=6