ANSWERS: 1
  • sin(5pi/6) = sin(pi/6) To better see this, if your angle starts on the x-axis and goes counterclockwise and the length of the arms is one, then sin gives you the height above the x-axis. pi radians is 180 degrees. sin(pi/6) is the same height as sin(pi - (pi/6)) sin^-1 of that gives you all the angles that have that height: pi/6, 5pi/6 and any multiple of 2pi added to those.

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