(a) Given that the angle must be coterminal with this other angle:

By definition, Coterminal Angles have the same initial side and they also have the same terminal side.
In this case, knowing that the angle must be between these angles:

You can find it by adding 360 degrees to the given angle:

(b) Given the angle:

You know that the coterminal angle must be between:

Therefore, you can find it as follows:

Hence, the answers are:
(a)

(b)
