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If frac{1}{x}+x = 2costheta, then x^n+fr...

If `frac{1}{x}+x = 2costheta`, then `x^n+frac{1}{x^n}` is equal to

A

`2cosntheta`

B

`2sinntheta`

C

`cosntheta`

D

`sinntheta`

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