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(a + b - c)² = 45?

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

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

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

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

ANS : 2

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