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The sum of a cubed of two binomial is equal to the cube of the first term, plus three times the square of the first term by the second term, plus three times the first term by the square of the second term, plus the cube of the second term.

(a + b)3 = a3 + 3a2b + 3ab2 + b3

            = a3 + 3ab (a + b) + b3
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