Differentiate $\log\left(x^{2} + 4\right)$ with respect to $x$.

Explanation

1. 01

   $\frac{d}{dx}\log u = \frac{1}{u}\frac{du}{dx}$, with $u = x^{2} + 4$.

2. 02

   $\frac{1}{x^{2} + 4} \cdot 2x = \frac{2x}{x^{2} + 4}$.