So if I’m not mistaken, we can always find the other values for extra values for the same angle in the following way:
sin(a) = sin (180° - a)
tan(a) = tan(180°+ a)
cos(a) = cos(-a) or cos (360 - a)
I mean, you can always remove or add 360 to any of these but with cos it just seemed useful to include it as it’s in the “first round trip”