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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 - 54ax^5 + 117a^2x^4 - 116a^3 x^3 + 117a^4 x^2 - 54a^5 x 27a^6`
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