Expand[(x^4 + 5 I x^3 - (1+ 2 I)x + (3- 4I))(x^4 -5 I x^3 - (1- 2 I)x + (3+4I))]Expand[(x^4 + 5 I x^3 - (1+ 2 I)x + (3- 4I))(x^4 -5 I x^3 - (1- 2 I)x + (3+4I))]

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