\[ \large f(x) = \frac{\alpha x}{x+1} \]
###### Image Credit: Flickr Eliana LĂșcio.

For \(x\ne-1\), consider a function \(f\) as described above for some constant \(\alpha\). What is the value of \( \alpha\) for which \(f(f(x)) \) is an identity function?

**Clarification**: \(g(x) \) is an identity function if \(g(x) = x\).

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