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If x satisfies x^(2)-2x cos theta +1=0, ...

If x satisfies `x^(2)-2x cos theta +1=0`, then the value of `x^(n)+((1)/(x^n))` is

A

`2^(n) cos n theta`

B

`2^(n) cos^(n) theta`

C

`2 cos^(n) theta`

D

`2 cos n theta`

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The correct Answer is:
D
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