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2 (a²+ b²) = কত?

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

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

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

{(a + b)}^{2} - 4 a b

ANS : 3

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