First convert the angle measure from radians to degrees using the formula
![\theta\cdot(180)/(\pi)](https://img.qammunity.org/2023/formulas/mathematics/high-school/jkzpswir3xv9c4ch9wvzjulpdq8kdym6fr.png)
Were θ represents the angle of interest
So for this exercise the angle is pi, so:
![\pi\cdot(180)/(\pi)=180](https://img.qammunity.org/2023/formulas/mathematics/high-school/sgy17psoo8q4ar7z8iji5gpuk1y81kr003.png)
Now using the calculator you can determine tha tangent of negative 180º
tan(-180º)=0
So the tangent of negative pi should also be zero