The coterminal angles are given as follows:
a) 0º.
b) 120º.
The coterminal angle of a negative angle between 0 and -360º = -2pi is found adding 360º = 2pi to the angle, hence:
-2pi + 2pi = 0, which is the answer to item a.
The coterminal angle is found taking the remainder of the division of the angle by 360º.
The remainder of the division of 480º by 360º is of 120º, hence the coterminal angle of 480º is of 120º.
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