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= a^2+2ab+b^2
b. (a-b)^2
= a^2-2ab+b^2
c. (a+b)(a-b)
= a^2-ab+ab-b^2
= a^2-b^2
d. (a+b)^3
= (a+b)(a+b)(a+b)
= (a^2+2ab+b^2)(a+b)
= a^3 + 3a^2b + 3ab^2 + b^3
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