Simplify the following:
(i) (a + b)2 + (a - b)2
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13
Answer:-
(a + b)^2 + (a - b)^2
a^2 + b^2 + 2ab + (a^2 + b^2 - 2ab)
a^2 + b^2 + 2ab + a^2 + b^2 - 2ab
= 2a^2 + 2b^2
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