20. Let z, and z be th roots of unity which aubtend a rightangle at th – InterviewSolution

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1.	20. Let z, and z be th roots of unity which aubtend a rightangle at the origin, theri 'n' must be of the form(a) 4k +1 (b) 4k2(c) 4k +3 (d) 4k
Answer» why do u get i in second step?

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