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If 2 Costheta=x+1/x then 2 cos 3theta=...

If `2 Costheta=x+1/x` then `2 cos 3theta=`

A

`x^(3)-1/x^(3)`

B

`x^(3)+1/x^(3)`

C

`x^(4)-1/x^(4)`

D

`x-1/x`

Text Solution

Verified by Experts

The correct Answer is:
B
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