5.3 The Fundamental Theorem of Calculus/10

$g(r)=\int _{0}^{r}{\sqrt {x^{2}+4}}dx$

Failed to parse (Conversion error. Server ("https://en.wikipedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle {\frac {d}{dx}}\int _{0}^{r}{\sqrt {x^{2}+4}}dx}