{1 /(1 + x(b - a) + x(c - a) )}+{ 1 /(1 + x(a - b) + x(c - b))} + {1/(1 + x(b - c) + x(a

{1 /(1 + x^{(b - a)} + x^{(c - a)} )}+{ 1 /(1 + x^{(a - b)} + x^{(c - b)})} + {1/(1 + x^{(b - c)} + x^{(a - c)})}= ?