Chapter 3.6, Problem 218E

For the following exercises, given $y=f\left(u\right)$ and $u=g\left(x\right)$ , find $\frac{dy}{dx}$ by using Leibniz’s notation for the chain rule: $\frac{dy}{dx}=\frac{dy}{du}\frac{du}{dx}$ .

218. $y=\tan u,u=9x+2$