$a^2-b^2$

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$a^2-b^2$

A(a+b)(a-b)

B $a^2-2ab+b^2$

C(a-b)(a-b)

D(a-b)

Answer:

$(a+b)(a-b)$

$=a\times a-a\times b+b\times a-b\times b$

$= a^2 -ab +ab - b^2$

$= a^2 - b^2$

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