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\frac{1}{2} {(a + b)^{2} + (a - b)^{2}} =

কত?

a^{2} + b^{2}

a^{2} - b^{2}

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

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

ANS : 1

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