(x^4-5x+9+x^2)-(x^3+4x^2-4)
x^4-5x+13-13x^2-x^3
=x^4-x^3-3x^2-5x+13
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(x^4-5x+9+x^2)-(x^3+4x^2-4)
x^4-5x+13-13x^2-x^3
=x^4-x^3-3x^2-5x+13