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1. $a^{2} + b^{2} = ?$

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

Answer: Option B

Explanation:

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