Simplify: `(x/2+y/3)^3-\ \ (x/2-y/3)^3`

Explanation

To simplify the expression \((x/2 + y/3)^3 - (x/2 - y/3)^3\), we can follow these steps:

### Step 1: Identify \(a\) and \(b\)
Let:
- \(a = \frac{x}{2}\)
- \(b = \frac{y}{3}\)

### Step 2: Rewrite the expression
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