(2x + 1)3
with identity
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(2x+1)³
using identity - (a+b)³=a³+b³+3ab(a+b)
(2x)³+(1)³+3(2x)(1)(2x+1)
8x³+1+6x(2x+1)
8x³+1+12x²+6x
8x³+12x²+6x+1
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