Control-drag (or type) $f\left(x\right)\=\dots$
Context Panel: Assign Function

Figure 1.1.7 shows the oscillatory behavior of $f$. As $x$ nears zero, $1\/x$ becomes larger and larger. Hence, all the oscillations of $\sin \left(\mathrm{\θ}\right)$ for larger and larger values of $\mathrm{\θ}$ are compressed into the region near $x\=0$. Consequently,  $f\left(x\right)$ assumes all the values of $\sin \left(\mathrm{\θ}\right)$ repeatedly, and the limit will fail to exist because of "infinite oscillation."

Expression palette: Limit template
Context Panel: Evaluate and Display Inline