If f,g,h are the internal bisectors of a...

If f,g,h are the internal bisectors of a `/_\ ABC` then `1/f cos (A/2)+ 1/g cos (B/2) +1/h cos (C/2)=` (A) `1/a+1/b-1/c` (B) `1/a-1/b+1/c` (C) `1/a+1/b+1/c` (D) none of these

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