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OpenStudy (anonymous):
HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! For questions 16 - 19, write each expression in the standard form for the complex number a + bi. 16. [ 4 ( cos (7pi/9) + i sin (7pi/9) ]^3 17. [ 1/2 ( cos (72) + i sin (72) ) ]^5 18. The complex fifth roots of 5 - 5 sqrt (3) i. 19. Find all seventh roots of unity
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