Is it constant or not?

Let \(X\) be the set of all positive integers greater than or equal to 8 and let \(f: X \to X\) be a function such that \(f(x+y)=f(xy)\) for all \(x\) and \(y\) greater than or equal to 4. If \(f(8)=9\). Find \(f(9)\).

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