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A. Find the cube of each term to get the first and last terms
b. the second term is three times the product of the square of the first term and the second term
c. the third term is three times the product of the first term and the square of the second term.

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Notice that the product of (x+y) (cube) is a  multinomial of 4 terms where. 
the 1st term x (cubed), is the cube of the first term
the 2nd term, 3x(squared)y, is3 times the product of Y and the sqaure of X;
the 3rd term, 3xy(squared), is 3 times the product of x and the suqare of y;
the 4th term, y(cubed), is the cube of the last term, y.
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