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Let `alpha` and ` beta` be any two positve values of x for which `2 cos x, | cos x|` and `1-3 cos^(2)x` are in GP. The minium 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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