Question 92
For all admissible $a$, $b$, $c$ find all possible values of the expression
$$
\frac{(a+b-c)^2}{(a-c)(b-c)} + \frac{(b+c-a)^2}{(b-a)(c-a)} + \frac{(c+a-b)^2}{(c-b)(a-b)}
$$
$$
\frac{(a+b-c)^2}{(a-c)(b-c)} + \frac{(b+c-a)^2}{(b-a)(c-a)} + \frac{(c+a-b)^2}{(c-b)(a-b)}
$$