In this animation we plot [math]y=cos(\alpha)[/math]. Here the label and unit on the horizontal is [math]\alpha[/math] in degrees. There is no unit on the [i]y[/i]-axis. The [i]y[/i]-value of the cosine function for the angle [math]\alpha[/math] is the [i]x[/i]-coordinate of the point T. (Remember: the [i]y[/i]-value of the sine function for this angle is the [i]y[/i]-coordinate of the point T.)