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

A. $a^{2} + b^{2}$
B. $a^{2} + b^{2}$
C. $a^{2} + b^{2}$
D. $a^{2} + b^{2}$

Answer: Option A

Explanation:

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