expand the following (3a+1/3)^3
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(A+b)^3=a^3+b^3+3ab(a+b)
So, by solving,
27a^3+1/27+3a(3a+1/3)
By solving the bracket,
27a^3+1/27+a(9a+3)
27a^3+1/27 +9a^2+3a
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