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Find the expansion of (3x^2 - 2ax + 3a^2...

Find the expansion of `(3x^2 - 2ax + 3a^2)^3` using binomial theorem.

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The correct Answer is:
`=27x^(6)-54x^(5)a+117x^(4)a^(2)-116x^(3)a^(3)+117x^(2)a^(4)-54xa^(5)+27a^(6)`
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