(2a-b)*(4a²+2ab+b²)=(2a)³-b³=8a³-b³
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(a-b)(a²+ab+b²)=a³-b³
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(2a-b)*(4a²+2ab+b²)=(2a)³-b³=8a³-b³
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(a-b)(a²+ab+b²)=a³-b³