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F (x) = 1 + X / 1-x, F1 (x) = f (x), FK + 1 (x) = f [FK (x)], k = 1,2..., find F3 (x), F4 (x), F5 (x) I figured out that F1 (x) = 1 + X / 1-x, F2 (x) = - 1 / x, but F3 (x), F4 (x), F5 (x) are not big
fk(x)=f(k+4)(x)
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