Find all specified roots.Seventh roots of 1.
A. 1, cis , cis
, cis
, cis
, cis
, cis
B. -1, cis , cis
, cis
, cis
, cis
, cis
C. 1, cis , cis
, cis
, cis
, cis
, cis
D. 1, cis , cis
, cis
, cis
, cis
, cis
, -1
Answer: C
Mathematics
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