Differentiate `log(x+sqrt(a^2+x^2))` with respect to `x` .

Explanation

To differentiate the function \( y = \log(x + \sqrt{a^2 + x^2}) \) with respect to \( x \), we can follow these steps:

### Step 1: Identify the function
We have:
\[ y = \log(x + \sqrt{a^2 + x^2}) \]

...