What traditional African export system from 1200-1450 continues into 1450-1750

Briefly explain one difference in the practice of realpolitik by louis napoleon and otto von bismarck.

Hurry: the angle measures associated with which set of ordered pairs share the same reference angle? (-square-root 3/2, 1/2) , (-1/2, -square-root 3/2) (1/2, -square-root 3/2) , (-square-root 3/2, 1/2) (-1/2, -square-root 3/2), (1/2, square-root 3/2) (square-root 3/2, 1/2) , (1/2, square-root 3/2)

Which of the following is not one of the seven points from the pre-start checklist recommended by the nsc