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Which of the following is not standard identity?

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$(a + b)^{2} = a^{2} + 2 a b + b^{2}$

$a^{2} + b^{2} = (a + b) (a - b)$

$a^{2} - b^{2} = (a + b) (a - b)$

$(a - b)^{2} = a^{2} - 2 a b + b^{2}$

answer is D.

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$a^{2} + b^{2} = (a + b) (a - b)$ is not standard identity

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