Answer
$0$
Work Step by Step
RECALL:
In a unit circle,
$\tan{s} = \frac{y}{x}$
(Refer to Figure 13 on page 111)
The terminal side of the angle $3\pi$ intersects intersects the unit circle at the point $(-1,0)$.
This point has $x=-1$ and $y=0$.
Since $\tan{s}=\frac{y}{x}$, then
$\tan{3\pi} =\frac{0}{-1}=0$
