For which of the following functions f is f(y) = f(1-y) for all of y?
`f(y) = 3y + 2`
`f(y) = 1-y^2`
`f(y) = 4y^2 * (2-2y)^2`
`f(y) = y/(y-1)`
`f(y) = y/(y+1)`
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