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y = (x-1)/(x+1)
yx+y = x-1
(1-y)x = 1+y
x = (1+y)/(1-y)
f^(-1)(x) = (1+x)/(1-x)
f^(-1) (1/2) = ( 3/2) /(1/2) = 3
yx+y = x-1
(1-y)x = 1+y
x = (1+y)/(1-y)
f^(-1)(x) = (1+x)/(1-x)
f^(-1) (1/2) = ( 3/2) /(1/2) = 3
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