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The equation whose roots are the n th po...

The equation whose roots are the n th powers of the roots of the equation `x^(2)-2xcostheta+1=0` is

A

`x^(2)-2xcosntheta+1=0`

B

`x^(2)+2xcosntheta+1=0`

C

`x^(2)-2xcosntheta-1=0`

D

`x^(2)+2xcosntheta-1=0`

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