Neka je
![f : \mathbb{Z} \to \mathbb{Q}](/media/m/7/a/f/7af70f405f60ba2557152e45c8a1e1c8.png)
takva da vrijedi
![f \left( 1 \right)=2](/media/m/a/d/2/ad22c049392c7850b946026248e9493a.png)
i
![f \left( n+1 \right)= \frac{1+f \left( n \right)}{1-f \left( n \right)}, \, \, \, \text{za svaki } n \in \mathbb{Z}.](/media/m/b/6/9/b6994608c2cc0ba74876c25e3738ac66.png)
Odredite
![f\left(-73\right)](/media/m/d/e/0/de0da69bd56a4551b5793bef48a63622.png)
.
%V0
Neka je $f : \mathbb{Z} \to \mathbb{Q}$ takva da vrijedi $f \left( 1 \right)=2$ i $$ f \left( n+1 \right)= \frac{1+f \left( n \right)}{1-f \left( n \right)}, \, \, \, \text{za svaki } n \in \mathbb{Z}.$$
Odredite $f\left(-73\right)$.