4. Find the definite integral $\int \int_R \frac{1}{\sqrt{x^2+y^2}} dA = ?$ where $R = x^2 + y^2 \leq 9$.
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4. Find the definite integral $\int \int_R \frac{1}{\sqrt{x^2+y^2}} dA = ?$ where $R = x^2 + y^2 \leq 9$.