Differentiate `e^(3x)` from first principles

Explanation

To differentiate \( e^{3x} \) from first principles, we will follow the definition of the derivative. The derivative of a function \( f(x) \) at a point \( x \) is given by:

\[ f'(x) = \lim_{h \to 0} \frac{f(x + h) - f(x)}{h} \]

### Step 1: Define the function
Let \( f(x) = e^{3x} \).
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