Question
Factor polynomial $$ xy^{3}-3x^{2}y^{2}-2xy^{2}+3x^{3}y+4x^{2}y+xy-3y-x^{4}-2x^{3}-x^{2}+x+3 $$
Answer
It seems that $ \color{blue}{ xy^{3}-3x^{2}y^{2}-2xy^{2}+3x^{3}y+4x^{2}y+xy-3y-x^{4}-2x^{3}-x^{2}+x+3 } $ cannot be factored out.
Explanation
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