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

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

Text Solution

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The correct Answer is:
C
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