add the following : x^3 - 2x^2y + 3xy ^2 - y^3 , 2x^3 - 5xy^2 + 3x^2y - 4y^3
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x³-2x²y+3xy²-y³, 2x³-5xy²+3x²y-4y³
Add them
=x³-2x²y+3xy²-y³+2x³-5xy²+3x²y-4y³
=3x³+x²y-2xy²-5y³
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