Chapter 2.4, Problem 32E

Finding vertical asymptotes Find all vertical asymptotes x = a of the following functions. For each value of a, determine $\underset{x\to a^{+}}{\lim }f(x),\underset{x\to a^{-}}{\lim }f(x)$, and $\underset{x\to a}{\lim }f(x)$.

32. $f(x)=\frac{\cos x}{x^2+2x}$