### Home > A2C > Chapter 12 > Lesson 12.3.2 > Problem12-151

12-151.

Where is the $\operatorname{tan} θ$ undefined? Use the unit circle to support your answer.

$\text{Remember} \operatorname{tan}\theta=\frac{\operatorname{sin}\theta}{\operatorname{cos}\theta}.$

Where is $\operatorname{cos}θ = 0$?