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Factorise a^3+b^3+c(a^2+b^2-ab)
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a^3+b^3+c(a^2+b^2-ab)
a^3 + b^3 = (a+b)(a^2 - ab + b^2)
so a^3+b^3+c(a^2+b^2-ab)
= (a+b)(a^2 - ab + b^2) + c(a^2 + b^2 - ab)
= (a^2 - ab + b^2)(a+b+c)
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