Show that 11+xb-a+xc-a+11+xa-b+xc-b+11+xb-c+xa-c=1.

Show that $\frac{1}{1 + x^{b - a} + x^{c - a}} + \frac{1}{1 + x^{a - b} + x^{c - b}} + \frac{1}{1 + x^{b - c} + x^{a - c}} = 1$ .

Match the items on the right to the items on the left.

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