1.

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

Answer»

`(1)/(2 SQRT(2)R`
2R
`(2)/(R)`
None of these

Answer :B


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