Simplyfiy (x+1) whole cube -(x-1) whole cube
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[tex](x+1)^{3}-(x-1)^{3}
=x^{3}+1+3.x.1(x+1)-(x^{3}-1-3.x.1(x-1))
=3x(x+1)+3x(x-1)+2
=6x^{2}+2[/tex]
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