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Add the following expressions: (i) x^3...

Add the following expressions: (i) `x^3-2x^2y+3x y^2-y^3,\ 2x^3-5x y^2+3x^2y-4y^3` (ii) `a^2-2a^3b+3a b^3+4a^2b^2+3b^4,-2a^4-5a b^3+7a^3b-6a^2b^2+b^4`

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Add the following expressions: (i) x^3-2x^2y+3x y^2-y^3,\ 2x^3-5x y^2+3x^2y-4y^3 (ii) a^2-2a^3b+3a b^3+4a^2b^2+3b^4,-2a^2-5a b^3+7a^3b-6a^2b^2+b^4

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