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Factorize(a+b)^3-a-b...

Factorize`(a+b)^3-a-b`

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The correct Answer is:
`(a+b)(a+b+1)(a+b-1)`
`(a+b)^3-a-b=(a+b)^3-(a+b)=(a+b)[(a+b)^2 -1] =(a+b)[(a+b)62-1^2]` .
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