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(a+b)³ = a³+3a²b+3ab²+b³
(a-b)³ = a³-3a²b+3ab²-b³

In other words, 
1st step: the cube of the first term
2nd step: plus/minus 3 times the square of the first term multiplied by the second term
3rd step: plus 3 times the first term multiplied by the square of the second term
4th step: plus/minus the cube of the second term
0 0 0
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