Use de Moivre’s formula to verify that the 5th roots of unity - 94906

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A. Use de Moivre’s formula to verify that the 5th roots of unity form a group under complex multiplication, showing all work. B. Let F be a field. Let S and T be subfields of F. Use the definitions of a field and a subfield to prove that S ? T is a field, showing all work.
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