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If x+(1/x)=2costheta then for any intege...

If `x+(1/x)=2costheta` then for any integer n,`x^n+1/x^n=`

A

`2cosntheta`

B

`2sinntheta`

C

`2icosntheta`

D

`2isinntheta`

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The correct Answer is:
A
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