(a+b)(a+b)(a+b) -a -b
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(a+b)^3-(a+b)
=(a+b){(a+b)^2-1}
=(a+b)(a+b+1)(a+b-1)
=(a+b){(a+b)^2-1}
=(a+b)(a+b+1)(a+b-1)
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