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নিচের কোনটি অভেদ?

x^{2} - 5 x + 6

{(a - 4)}^{2}

(x + a) (x + b) = x^{2} + (a + b) x + a b

{(a + b)}^{2} + {(a - b)}^{2} = a^{2} + b^{2}

ANS : 3

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