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If 2 cos theta = x + 1/x "state which of...

If `2 cos theta = x + 1/x "state which of the following is the value of" cos 2 theta?`

A

`x^(2) +1/x^(2)`

B

`1/2 (x^(2) + 1/x^(2))`

C

`1/2 ( x^(3) + 1/x^(3))`

D

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

Text Solution

Verified by Experts

The correct Answer is:
B
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