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If x+(1)/(x)=2costheta, then x^(n)+(1)...

If `x+(1)/(x)=2costheta`, then `x^(n)+(1)/(x^(n))` is equal to

A

`2^n cos prop`

B

`2^n cosn prop`

C

`2i cos n prop`

D

`2 cos n prop`

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IPUCET PREVIOUS YEAR PAPERS-GGSIPU MATHEMATICS 2006-MCQ
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