Question 638289
x^3-y^3+x^2-y^2 
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= [(x-y)(x^2+xy+y^2)]+[(x+y)(x-y)]
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= (x-y)(x^2+xy+y^2+x+y)
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= (x-y)(x^2 +xy + x + y + y^2)
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Cheers,
Stan H.