5.3 The Fundamental Theorem of Calculus/10

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<math> \begin{align}

&\g(r)=\int_{0}^{r}\sqrt{x^2+4} dx \\[2ex]

&\frac{d}{dx}\int_{0}^{r}\sqrt{x^2+4}dx [2ex]

&\sqrt{x^2+4}

\end{align} <math>