Factorise by grouping method: x2 + y2 + x + y + 2xy.
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X^2+y^2+x+y+2xy
(X^2+x) + (y^2+y) +2xy
X^3 + y^3 + 2xy
2x^4 y^4
(X^2+x) + (y^2+y) +2xy
X^3 + y^3 + 2xy
2x^4 y^4
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