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ab= কত ?

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

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

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

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

ANS : 2

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