multiply the product : a2(a+b)+2ab(a+b)+b2(a+b) .
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Product of (a+b)(a2+2ab+b2)
⇒a(a2+2ab+b2)+b(a2+2ab+b2)
⇒a3+2a2b+ab2+a2b+2ab2+b3
⇒a3+b3+3a2b+3ab2=(a+b)3
Hence, the answer is (a+b)3.
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