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If in a triangle A B C ,(1+cosA)/a+(1+co...

If in a triangle `A B C ,(1+cosA)/a+(1+cosB)/b+(1_(cosC))/c` `=(k^2(1+cosA)(1+cosB)(1+cosC)/(a b c)` , then `k` is equal to `1/(2sqrt(2)R)` (b) `2R` (c) `1/R` (d) none of these

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