Αντιγραφή του Tan(x) & Unit Circle - Degrees

In this animation we plot . Here the unit on the x-axis is degrees. There is no unit on the y-axis. The y-value of the tangent function for this angle is the y-coordinate of the point T divided by the x-coordinate of the point T.
Move the slider to α=60°. The . Do you know the exact value of ? Move the slider to α=150°. The . Do you know the exact value of ? Now, let α=–60°. Move the slider to the corresponding angle between 0° and 360°. The . Do you know the exact value of ? Does this agree with the fact that tan(–α)=–tan(α)?