Find an angle between 0 and 2π that is coterminal with the given angle. Give answer in terms of π.
-2pi/3 . ? in radians

Question

Find an angle between 0 and 2π that is coterminal with the given angle. Give answer in terms of π. 
-2pi/3 . ? in radians

anonymous · Answer

all you have to do is add or subtract 2pi or some other amount of 2pi for each one

in this one, add 2pi to -2pi/3

anonymous · Answer

How do I know if I have add or subtract ? ==

anonymous · Answer

is - 2pi/3 in the interval from 0 to 2pi?
if it's not then, add or subtract 2pi so the angle is between 0 and 2pi

anonymous · Answer

$$-\frac{2\pi}{3} + 2\pi = -\frac{2\pi}{3} + \frac{6\pi}{3}$$

anonymous · Answer

So confuse ! So how do I know when I have  to ADD OR SUBTRACT ?