Factorise:- (a+b)^3-a-b
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⇒![\sf ( a + b )\: [ \:( a + b )^{2} - 1\: ] \sf ( a + b )\: [ \:( a + b )^{2} - 1\: ]](https://tex.z-dn.net/?f=%5Csf+%28+a+%2B+b+%29%5C%3A+%5B+%5C%3A%28+a+%2B+b+%29%5E%7B2%7D+-+1%5C%3A+%5D+)
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Mankuthemonkey01:
(a+b)² - 1 = (a+b+1)(a+b-1)
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