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In Delta ABC, if the sides a, b, c are i...

In `Delta ABC`, if the sides a, b, c are in geometric progression and the largest angle exceeds the smallest angle by `60^(@)`, then `cos B =`

A

`(sqrt(13) + 1)/(4)`

B

`(1-sqrt(13))/(4)`

C

1

D

`(sqrt(13)-1)/(4)`

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The correct Answer is:
D
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