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The fourth roots of unity in the complex plane are
A1, -1, i, -i
B1, i, 2i, 2+i
C1, -1, 1+i, i
Di, -i, 2, -2
Answer & Solution
Correct answer: A. 1, -1, i, -i
These are the solutions of z^4 = 1: 1, i, -1 and -i, spaced 90 degrees apart on the unit circle.
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