Mathematics

Mathematics, 12.12.2020 16:30, DerekMoncoal

Which expression represents a 5th root of –i? a) $cos(\frac{7\pi}{4})+sin(\frac{7\pi}{4})$
b) $cos(\frac{7\pi}{6})+sin(\frac{7\pi}{6})$
c) $cos(\frac{7\pi}{8})+sin(\frac{7\pi}{8})$
d) $cos(\frac{7\pi}{10})+sin(\frac{7\pi}{10})$

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