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Resultant[x^4 - 5 x^3 + a x^2 - 7 x + 2, D[x^4 - 5 x^3 + a x^2 - 7 x + 2,x],x]
Resultant[x^4 - 5 x^3 + a x^2 - 7 x + 2, D[x^4 - 5 x^3 + a x^2 - 7 x + 2,x],x]
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