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I believe that N30 degrees means 30 degrees North.
They are related becasue they descibe a point on the coordinate. The X coordinate determine if the direction is east or west. If it is in negatives, the point is west and if in the positives, it is in the east. The Y coordinates determine if a point is north or south. If it is in the negatives, the point is south and if it is in the positives, the point is in the north. For example if the X coordinate is 5 and the y coordinate is -15, the point would be 5 degrees east and 15 degrees south. I hope this helped.
it is 0because on the unit circle 270 is the negative y axis (0,1) the x coordinate is the cos value