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If in a triangle ABC,(1+cosA)/(a)+(1+cos...

If in a triangle `ABC,(1+cosA)/(a)+(1+cosB)/(b)+(1+cosC)/(c)=(k^(2)(1+cosA)(1+cosB)(1+cosC))/(abc)`then k is equal to

A

`(1)/(2 sqrt(2)R`

B

2R

C

`(2)/(R)`

D

None of these

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The correct Answer is:
B
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