tan 0 quadrant angles

The tangent function has the following values in each of the four quadrants:

- In the first quadrant (0° to 90°), the tangent function is positive.
- In the second quadrant (90° to 180°), the tangent function is negative.
- In the third quadrant (180° to 270°), the tangent function is positive.
- In the fourth quadrant (270° to 360°), the tangent function is negative.

So, in the first and third quadrants, the tangent function has positive values, and in the second and fourth quadrants, it has negative values.