Add. (x2+1−4x3+3x4)+(−x2−2x4+x3+4) Express the answer in standard form.

x^2+1-4x^3+3x^4-x^2-2x^4+3x^3+4
1-4x^3+3x^4-2x^4+3x^3+4
3x^4-2x^4-x^3+5
x^4-3x^3+5
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