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

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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