Evaluate: `int(dx)/sqrt(2-6x-9x^(2))`dx

Explanation

To evaluate the integral \( \int \frac{dx}{\sqrt{2 - 6x - 9x^2}} \), we will follow these steps:

### Step 1: Rewrite the expression under the square root
We start with the expression under the square root:
\[ 2 - 6x - 9x^2 \]
To rewrite this, we can rearrange it by adding and subtracting 1:
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