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\frac{a^{2} + b^{2} - c^{2} + 2 a b}{a^{2} - b^{2} + c^{2} + 2 a c}

a+b+c

\frac{a + b - c}{a - b + c}

\frac{a - b + c}{a + b - c}

\frac{a + b - c}{a + b + c}

ANS : 2

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