The Tangent Function Practice Test

In architecture, tan $\theta=\dfrac{\sin\theta}{\cos\theta}$; from 30 m away, a 20 m tower gives $\tan\theta=\dfrac{20}{30}$. What is $\theta$?

Given tangent $\tan\theta=\dfrac{\sin\theta}{\cos\theta}$ and vertical asymptotes where $\cos\theta=0$, which equation represents all asymptotes of $y=\tan x$?