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[" If "z" and "w" are two complex numbers such that "|zw|=1" and "arg(z)-arg(w)=(pi)/(2)" ,then "],[[" (A) "bar(z)w=i," (B) "zbar(w)=(-1+i)/(sqrt(2))],[" (C) "zbar(w)=(1-i)/(sqrt(2))," (D) "bar(z)w=-i]]

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