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

If `cos theta =1/2 (x+1/x ) ,` then ` 1/2(x^(2) +1/(x^(2)))` is equal to :

A

`sin2theta`

B

`cos 2theta`

C

`tan 2theta`

D

`sec 2theta`

Text Solution

Verified by Experts

The correct Answer is:
B
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