Find the second order derivatives of the functions given.
`e^(6x)cos3x`.

Explanation

To find the second order derivative of the function \( y = e^{6x} \cos(3x) \), we will follow these steps:

### Step 1: Find the First Derivative
We will use the product rule for differentiation, which states that if \( y = u \cdot v \), then \( \frac{dy}{dx} = u'v + uv' \).

Let:
- \( u = e^{6x} \)
- \( v = \cos(3x) \)
...