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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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