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কোনটি অভেদ?

(x + 1)^{2} - (x - 1)^{2} = 4 x

(x + 1)^{2} - (x - 1)^{2} = 2 (x^{2} + 1)

(x + y)^{2} - (x - y)^{2} = 2 x y

(x - y)^{2} = x^{2} + 2 x y + y^{2}

ANS : 1

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