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If xr=cos(pi/(2^r))+isin(pi/(2^r)) , the...

If `x_r=cos(pi/(2^r))+isin(pi/(2^r))` , then the value of `x_1x_2x_3........oo` is :

A

`-1`

B

i

C

`-i`

D

1

Text Solution

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The correct Answer is:
A
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