a(a+b)^3-3a^2b(a+b) plleasee teel mme annssweerr
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a(a+b)^3-3a^2b(a+b)
=a(a+b){(a+b)^2-3ab}
=a(a+b) (a^2+2ab+b^2-3ab)
=a(a+b)(a^2-ab+b^2)
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