Ten > Algebraic Fraction
Simplify: $\rm \frac{(a-b)^2 - c^2}{a^2 - (b+c)^2} + \frac{(b-c)^2 - a^2}{b^2 - (c+a)^2} + \frac{(c-a)^2 - b^2}{c^2 - (a+b)^2}$
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