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If z=x+i y is a complex number with x ,y...

If `z=x+i y` is a complex number with `x ,y in Qa n d|z|=1,` then show that `|z^(2n)-1|` is a rational number for every `n in Ndot`

A

Irrational

B

Rational

C

Real

D

Non-real complex

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The correct Answer is:
B, C
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