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If costheta=1/2(a+1/a), then the value o...

If `costheta=1/2(a+1/a)`, then the value of `cos 3theta` is

A

`1/8(a^3+1/a^3)`

B

`3/2(a+1/a)`

C

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

D

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

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