It can be any number from 450000 to 549999. This is due to the fact that
when figures like this are reported they are either rounded up or down.
375/1000. You can then reduce that to get 3/8. So the answer is 3/8
In the half-angle formula for sine and cosine, notice that a plus/minus sign appears in front of each radical (square root). Whether your answer is positive or negative depends on which quadrant the new angle (the half angle) is in
1. 21,150
2. 2.5193
3. 27.98
4. 11,100