Given the function f (x-1 / x) = x2 + X2, then f (3) x is explained in detail

Let's make the topic clear first
The question seems to be: F (x-1 / x) = x ^ 2 + 1 / x ^ 2
If so, just formula: F (x-1 / x) = (x-1 / x) ^ 2 + 2, so f (x) = x ^ 2 + 2

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