y=1/x

y=1/x^2

y=1/x^3

y=1/(x+1)

y=1/(x-1)

y=1/(x+1)^2

y=(x-1)/(x+1)

y=(x+1)/(x-1)

y=(x^2+1)/x

y=(x^2-1)/x^2

y=x/(x^2-1)

y=(1-x)/x^2

y=(1+x)/x

y=-x/(x+2)

y=-x/(x-1)

y=x^2/(x+2)

y=x^2/(x^2-1)

y=1/(x^2-1)

y=(x^2+1)/(x+1)

y=(x^2+1)/(x^2-1)

y=(x^2+1)/(x+1)^2

y=x^2/(x^2+x-2)

y=x/abs(x)

y=abs(x+2)/x

y=x/(1-abs(x))

y=(1+abs(x))/x

y=(1-abs(x))/x

y=x/(1+abs(x))

y=(abs(x)+1)/(abs(x)-1)

y=1/(abs(x)-1)^2