Integrate the functions`sqrt(1+(x^2)/9)`

Explanation

To solve the integral of the function \( \sqrt{1 + \frac{x^2}{9}} \), we will follow these steps:

### Step 1: Write down the integral
We start by expressing the integral we need to solve:
\[ I = \int \sqrt{1 + \frac{x^2}{9}} \, dx \]

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