factories a^3 -b^3+1+ 3ab
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a=a
b=-b
c=c
a^3-b^3-c^3-3abc =(a+b+c)(a^2+b^2+c^2-ab-bc-ca)
now u will get answer
b=-b
c=c
a^3-b^3-c^3-3abc =(a+b+c)(a^2+b^2+c^2-ab-bc-ca)
now u will get answer
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