expanded form of ((1 - x^13) / (1-x)) ((1-x^8)/(1-x)) (1 + 3x + 3x^2 +x^3) (1 +2x +x^2)expanded form of ((1 - x^13) / (1-x)) ((1-x^8)/(1-x)) (1 + 3x + 3x^2 +x^3) (1 +2x +x^2)

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