Question

pls answer this in ful steps!
${x}^{3} {y}^{2} + {x}^{2} {y}^{3} - x {y}^{4} + xy \\ = {?}$ pls factorise
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Answer 1

x^3y^2 +x^2y^3 - xy^4 +xy

xy^2(x^2 - y^2) +xy(xy^2+1)

xy{y(x+y )(x-y) +xy^2 +1}