If sqrtx + (1)/( sqrtx) = 2 cos theta, ...

If `sqrtx + (1)/( sqrtx) = 2 cos theta, ` then `x ^(6) +x^(-6)=`

A

`2 cos 6 theta`

B

`2 cos 12theta`

C

`2 cos 3 theta`

D

`2 sin 3 theta`

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The correct Answer is:

B

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