f(0)= 1+0/1-0= 1
f(2)= 1+2/1-2= 3/-1= -3
f(-2)= 1-2/1+2= 1/3
f(a)= 1+a/1-a
f(1/a)=
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f(0)= 1+0/1-0= 1
f(2)= 1+2/1-2= 3/-1= -3
f(-2)= 1-2/1+2= 1/3
f(a)= 1+a/1-a
f(1/a)=![\frac{1+\frac{1}{a} }{1-\frac{1}{a} }=\frac{a+1}{a-1} \frac{1+\frac{1}{a} }{1-\frac{1}{a} }=\frac{a+1}{a-1}](https://tex.z-dn.net/?f=%5Cfrac%7B1%2B%5Cfrac%7B1%7D%7Ba%7D%20%7D%7B1-%5Cfrac%7B1%7D%7Ba%7D%20%7D%3D%5Cfrac%7Ba%2B1%7D%7Ba-1%7D)