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Let alpha, beta be any two positive valu...

Let `alpha, beta` be any two positive values of x for which `2"cos"x, |"cos"x| " and " 1-3"cos"^(2) x` are in G.P. The minimum value of `|alpha -beta|`, is

A

`pi//3`

B

`pi//4`

C

`pi//2`

D

none of these

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The correct Answer is:
D
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