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If sqrtx+(1)/(sqrt(x))=2costheta then x^...

If `sqrtx+(1)/(sqrt(x))=2costheta` then `x^(6)+x^(-6)=`

A

`2"cos"6theta`

B

`2"cos"12theta`

C

`2"cos"3theta`

D

`2"sin"3theta`

Text Solution

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The correct Answer is:
B
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