Precalculus Examples

$\tan (- 120)$

Step 1

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant.

$\tan (60)$

Step 2

The exact value of $\tan (60)$ is $\sqrt{3}$ .

$\sqrt{3}$

Step 3

The result can be shown in multiple forms.

Exact Form:

$\sqrt{3}$

Decimal Form:

$1.73205080 \dots$