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 \( \frac{dy}{dx} \)

Using the product rule, which states that if \( u \) and \( v \) are functions of \( x \), then \( \frac{d(uv)}{dx} = u'v + uv' \), we let:
- \( u = e^{6x} \)
- \( v = \cos(3x) \)

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