Factorize: `1-27\ a^3`

Explanation

To factorize the expression \(1 - 27a^3\), we can follow these steps:

### Step 1: Recognize the form of the expression
The expression \(1 - 27a^3\) can be rewritten as \(1^3 - (3a)^3\). This is because \(27a^3\) is the cube of \(3a\).

### Step 2: Apply the difference of cubes formula
We can use the difference of cubes formula, which states that:
\[
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