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Which of these is a cube root of −1 other than −1 itself?
A(−1 + i√3)/2
B(1 + i)/2
C(1 + i√3)/2
D(√3 + i)/2
Answer & Solution
Correct answer: C. (1 + i√3)/2
(1 + i√3)/2 = cos 60° + i sin 60°, and its cube is cos 180° + i sin 180° = −1.
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