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Factorise (a+b) *3 -a-b.
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HII! HERE THE. ANSWER
==== (a+b)³-a-b
= by the formula..........
== (a+b)³=a³+b³+3a²b+3ab²
===== a³+b³+3a²b+3ab²-a-b
=====a²+b²+3a²b+3a²-- --) Is the answer
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