Question

Thanks campbell_st!!

Answer 1

you haven't considered the situation where

\[\sin(x) = -\sqrt{3}/2\],
which is the 3rd quadrant ( pi + angle)
or 4th quadrant (2pi - angle)

Answer 2

so the correct answers would be: pi/3, 2pi/3, 4pi/3, 5pi/3?

Answer 3

yes