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Solve the integral by applying the formula $\displaystyle\int\frac{x'}{x^2+a^2}dx=\frac{1}{a}\arctan\left(\frac{x}{a}\right)$
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$\frac{1}{\sqrt{9}}\arctan\left(\frac{x}{\sqrt{9}}\right)$
Learn how to solve problems step by step online. Integrate the function 1/(x^2+9) from -infinity to 3. Solve the integral by applying the formula \displaystyle\int\frac{x'}{x^2+a^2}dx=\frac{1}{a}\arctan\left(\frac{x}{a}\right). Simplify the expression inside the integral. Add the initial limits of integration. Replace the integral's limit by a finite value.