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1. $a b =$

A. $\frac{{(a + b)}^{2}}{2} - \frac{{(a - b)}^{2}}{2}$
B. $\frac{{(a + b)}^{2}}{2} - \frac{{(a - b)}^{2}}{2}$
C. $\frac{{(a + b)}^{2}}{2} - \frac{{(a - b)}^{2}}{2}$
D. $\frac{{(a + b)}^{2}}{2} - \frac{{(a - b)}^{2}}{2}$

Answer: Option B

Explanation:

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