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

Explanation

To find the expansion of \((3x^2 - 2ax + 3a^2)^3\) using the binomial theorem, we can treat it as a binomial expansion by grouping terms. Here’s a step-by-step solution:

### Step 1: Identify the terms
We can rewrite the expression as:
\[ (3x^2 + (3a^2 - 2ax))^3 \]
Let \(t = 3x^2\) and \(u = 3a^2 - 2ax\). Therefore, we need to expand \((t + u)^3\).
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