Differentiate `sqrt(sin3x)` from the first principle.

Explanation

To differentiate \( y = \sqrt{\sin(3x)} \) using the first principle of differentiation, we will follow the steps outlined below:

### Step 1: Define the function and the increment
Let \( y = \sqrt{\sin(3x)} \). We will consider a small increment \( \Delta x \) in \( x \), which leads to a corresponding increment \( \Delta y \) in \( y \).

### Step 2: Express \( \Delta y \)
The increment \( \Delta y \) can be expressed as:
\[
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