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If Zr =cos ((pi)/(2^r))+isin((pi)/(2^r))...

If `Z_r =cos ((pi)/(2^r))+isin((pi)/(2^r))` then `Z_(1).Z_(2).Z_(3)"…….."` upto `oo` equals

A

`-3`

B

`-2`

C

`1`

D

`-1`

Text Solution

Verified by Experts

The correct Answer is:
D
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