Find the derivative $of$ the function.

$g(x)={\displaystyle \underset{-5}{\overset{x}{}}}\frac{1}{t^2+4}dt$

$\frac{1}{29}$

$\frac{1}{x^2+4}$

$\frac{10}{841}$

$-\frac{2x}{(x^2+4{)}^2}$