CPM Homework Help : A2C Problem 12-152

State the sign ( $+ \text{ or } −$ ) of the tangent in each quadrant of the unit circle. Justify your answer.

Hint:

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

Where are the signs of $\operatorname{sin}θ$ and $\operatorname{cos}θ$ in each quadrant?