expand please ....

(A-B)3

(A+B)3

Expansion of (ab)3

 

and

 

 

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(A-B)3 = A3-3A2B+3AB2-B3

 

(A+B)3 = A3+3A2B+3AB2+B3

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more useful is Acube + Bcube = (a+b)(a^2-ab+b^2)

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