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Answer:
[tex]x^{4} -6x^{3} +13x^{2} -12x+4[/tex]
Step-by-step explanation:
[tex](x^{2} -3x+2)^{2} -4x+2\\(x^{2} -3x+2)(x^{2} -3x+2) -4x+2\\x^{4} -3x^{3} +2x^{2} -3x^{3} +9x^{2} -6x+2x^{2} -6x+4\\x^{4} -6x^{3} +13x^{2} -12x+4[/tex]