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Which set contains all the fourth roots of unity?
Ai and -i only
B1, -1, i, -i
C1 and -1 only
D1, -1, 2i, -2i
Answer & Solution
Correct answer: B. 1, -1, i, -i
The solutions of z⁴ = 1 are the four numbers 1, i, -1 and -i.
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