Find the derivative of x at `x = 1`.

Explanation

To find the derivative of the function \( f(x) = x \) at \( x = 1 \) using the first principle of derivatives, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Derivative Definition**:
The derivative of a function \( f(x) \) at a point \( x \) is defined as:
\[
f'(x) = \lim_{h \to 0} \frac{f(x + h) - f(x)}{h}
...