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-x^4 + 4x^3 - 6x^2 +4x + 15, x^4 + 4x^3 + 6x^2 + 4x + 15
-x^4 + 4x^3 - 6x^2 +4x + 15, x^4 + 4x^3 + 6x^2 + 4x + 15
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