derivation of (a+b)^3
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a^3 + 3a^2b + 3ab^2 + b^3
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Answer:
(a+b)(a+b)(a+b)=(a+b)^2(a+b)=(a^2+b^2+2ab)(a+b)
=a^3+b^3+3a^2b+3b^2a
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