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If `((1+i)/(1-i))^(x)=1 AA n in N` is (i) x = 2n+1 (ii) x =4n (iii) x=2n (iv) x=4n+1

A

` x = 2n+1`

B

x = 4n

C

x = 2n

D

x = 4n + 1

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